Re: Bouncing affliction
GURPS Supers has a limitation for Super Jump, called "Bouncing Only". You could use Super Jump with that limitation as the Afflicted advantage, paralleling things like using Growth or Shrinking in an Affliction build to make people grow or shrink.
But if this is just a thing to do to inanimate objects, and just to create a region of distraction and possible damage, then I'm going to suggest against that - it's really too complex, with either the player or the GM having to work out how many times, and to where, an object bounces to. That sounds like a huge headache, and something that would slow combat down to a crawl. Instead, what I'd suggest is building this as an Innate Attack. You'd need Area of Effect to cover the area it's bouncing in, Environmental or Accessibility to say it needs one or more small objects, Persistent so that it stays in the area for a while, and Bombardment, which means the projectile(s) need to make attack rolls against targets in the area, rather than hitting automatically, which should take care of the question of whether or not the bouncing object hits someone every turn.
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