Bounce

A bounce,<ref name=":0" /><ref name=":1" /> return to sender<ref name=":0" /> or rebound<ref>Maybe the line of thinking was that Kathryn and Ellie would fail in a similar way to how Molly had.  Maybe, as she’d prepared other individuals with knowledge of how to deal with demons, she’d anticipated that they would destroy themselves, attacking Laird or Alister or someone and having the demon rebuffed, sent back to the summoner.  A demon, ready at hand, that was capable of bypassing the typical defenses. Leaving the impulsive, stubborn, aggressive Kathryn and Ellie ill prepared for the rebound. - Excerpt from Sine Die 14.10</ref> refers to the natural tendency for harmful magic to rebound on the sender if successfully rebuffed.

Summons and hexes which are sent after a target, but successfully rebuffed, will often "rebound" against the summoner stronger than before. They could then be rebuffed by the original summoner, sending them back against the original target - but if they are bounced back a third time, they will be significantly strengthened.<ref name=":1">Bogeyman came with a container, practitioner broke the container? Approaches to binding rituals.

Sent bogeyman to go murder someone in the most horrible ways possible, but they were blocked, and came back to me, what does the practitioner do? Do the same thing, and hope they aren’t equipped to bounce it back for the third total time, because it would be far stronger on the third trip.- Excerpt from Malfeasance 11.2</ref><ref name=":0">One of the bogeymen they’d sent out the door only a minute ago.

“It’s a bounce!” Alexis called out, springing to her feet. “They blocked her somehow! She’s after the nearest available target!”

Return to sender.

A very good reason many practitioners were very careful before they sent a curse or a demon stomping over to their enemies. If they fucked up, or if the enemy was clever or strong enough, that same curse or demon or whatever could come back, stronger.
[...]
“Bounce her back,” I said.

“Antique box,” Alexis said, standing just to my left. She held a box a human might have been able to fit inside, but only if they really contorted themselves. “Not sure how to get her in it, but once we do, we can push her outside the library and remove the lid.”
[...]
The box fell, cracking on the floor.

Each return-to-sender makes the summoning stronger, I thought. - excerpt from Malfeasance 11.8</ref><ref>Barriers will serve their purpose, but hexes and deleterious magics will often glance off the Bane, rendering them a potent devise against the unwary. Without expecting their workings to go awry and come back to them, such a Magus might find themselves dealing with their own practises and the Bane both. - Excerpt from Duress 12.3</ref> This is because of the power, hostility and outrage they absorb from the person rebuffing them.<ref>He was wrong about what the crow was, but he still managed to capture and bind it.

He sent it back at the ones who had created it, with a touch of added power, hostility, outrage, given freely, and the compact of the Invader’s ways of dealing with spirits. A seal, which made the crow both less of what it had been and more a part of things. A different manner of things. - Excerpt from Interlude 11</ref> In the case of demons, some standard Diabolist techniques for warding them off become ineffective in the case of a bounce.<ref>A demon properly warded off will return to its master, and many conventional protections will cease to have effect. - Excerpt from Black Lamb's Blood, quoted in Interlude 4</ref>

Wearing a mask is sometimes sufficient to prevent an Other from identifying and returning to you; a technique often used by Summoners or those who deal primarily with hostile Others.<ref>“No.  I’ll keep your confidence.  The masks they’re talking about, they’re not uncommon in some circles.  When you deal with a lot of hostile Others, you don’t want them coming after you.  It’s also a way to make it easier to evade a bounce-back, from a curse or a wayward summoning.  I thought your own masks might be something like that.”

Brie continued chewing.

“Does that help us?” one of the girls asked.  It was a lower volume, which might have been her asking her friends.

“Summoners often do it,” Zed told them.  “They fabricate or conjure up Others, and if someone uses enough force, they can try to send that Other to the origin point.  The person who brought that Other there or brought it into being.” - Excerpt from Out on a Limb 3.z</ref>

If there's no original sender, or it can't be returned to the sender for some reason, the same effect can cause some rebuffed curses or Others to simply bounce back to the target after a while and attack more powerfully.<ref>I noticed the doom and followed it to her.  She was fending it off, but the way a curse, an omen, or a sending works, if you can’t bounce it back at the sender, or if there’s no sender, it can magnify.  The doom had swelled, going away for a time, picking up strength, then returning. - Excerpt from Out on a Limb 3.4</ref>

There is hypothetically an instance where one can 'pinball' a weak other against multiple points then sent against a specific target now magnified in power from the pattern.<ref>“You’re kind of on our turf, Wye.  Turf we swore to protect.  Musser pinballed a zombie thing in our general direction yesterday, it caused a lot of chaos, brought Witch Hunters into close proximity with innocents,” Avery said.

“Yeah.  Just your bog-standard hallow man.  Echo or wraith in a fleshly vessel.”

“Innocents were put at risk.” - Excerpt from Summer Break 13.5</ref><ref>Her eyes fell on an Other who was standing in traffic.  She had one blue eye, and then two dark brown eyes that overlapped one another.  Her face looked like a blood clot, her hair so matted with blood the point skin stopped and hair began was impossible to tell.  The eyes and one ear were clean and bloodless on that mass, and white teeth were pressed into the vaguely head-shaped bloody mass, some with traces of blood on them, others pristine, approximately where teeth should be, a leering ear-to-ear grin.

Tattered skin caked in clotting blood was indistinguishable from ragged and torn clothing, and the woman stood at a slight angle, leaning just enough to the right that it looked doable, but like a fall in the next moment wasn’t impossible.  There were traces of echo-ness at the edges of her, dark and faint.

A dark, grisly image for a slightly overcast summer afternoon.

And she was staring at Verona.
[...]
[Other presence in chapter] - Excerpt from Summer Break 13.5</ref>

References

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