Brute's Fury Proc
I found the patch note in question, but you're right, it really doesn't clear things up...
Main Hero: Chad Gulzow-Man (Victory) 50, 1396 Badges
Main Villain: Evil Gulzow-Man (Victory) 50, 1193 Badges
Mission Architect arcs: Doctor Brainstorm's An Experiment Gone Awry, Arc ID 2093
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It procs on power activation, not on hitting enemies. So it gets one chance to proc when you activate the power, and doesn't care whether you hit one target or sixteen.
It procced with no enemies nearby when I had it in Burn for a while. Burn is kind of a special case though, since it summons a pseudopet, so I'm not sure if it behaves the same way in other PBAoEs.
I remember seeing a patch note stating that this was changed so that it could only trigger once per activation, but I can't find that patch note, and even if I could, I'm not certain it would answer my question.
If it's put in an AoE, does it check just once, regardless of the number of targets? Or is it like Force Feedback, where it checks once for each target hit, but can only buff you once, no matter how many are hit?
Bonus question: If it's the former, does it have a chance to proc if there are no targets in range?
@Roderick