Don't see a thread on this, unless i missed it. Kitty's red is spawning punchy tiles on all damage, including match damage. clearly not in the power description.
sounds like it's focused fire caused? maybe not a bug? but maybe it is?
It seems linked with Deathlok's passive. Not quite sure what's causing it but once you take out Deathlok it will stop. must mean his bonus damage is counting.
pretty good defense Pair with Elektra to gain more red