Explosive Shards was also setup as a Immediate interrupt... In this case should be No Action.
And on powers that trigger on "first bloodied" or is "reduced to 0 hit points", could those be Daily or Encounter powers?
Immediate interrupts are now No Action when indicated
Powers that trigger on "first bloodied" or "is reduced to 0 hit points", are now Encounter powers if they were At-Will
Also, I really appreciate you finding these. I had gotten to the point were each NPC I was testing was passing the part I was checking, and areas of powers that I expected to work were too bothersome to recheck for each creature (I'd grow sleepy).
I'd rather spend my time coding and tweaking than go through lists of NPCs, reading every line, and confirming the result.