The IO system (currently) doesn't care about dots - so for click DoT powers like Shadow Maul it on only checks on the intial hit.
Toggles and autopowers check every 10 seconds if ther is a target.
Same with HoTs.
Orc&Pie No.53230 There is an orc, and somehow, he got a pie. And you are hungry.
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Negaduck: I see you found the crumb. I knew you'd never notice the huge flag.
Does the proc only have a chance to fire on the initial hit or does it also take each tic of damage into account?