The following abilities' effects need to proc at the start of their animation, not end.
-Disembowel
-Bio

I hate that I can't weave in Jumps or Legsweep until Disembowel animation is done, and as a SCH/SMN, if I do bio2>miasma>bio, i can't use Bane to spread all 3 effects until about 1.5-2 seconds after Bio is cast.