Here is the post from Sparton :-
"We have fixes to certain buff stealers stealing incorrect amounts already noted in the preliminary patch notes. Previous reports I've seen of this are already listed in these notes or were found to not actually be a bug, just a misunderstanding to the functionality of skills/effects being employed. If you have a more specific example of something that isn't in the preliminary notes, do let us know the specifics of the problem you're running into and we can investigate.
Regarding revenge chance, please keep in mind that every hit of damage has it's own independent proc chance for Revenge or Counter. As such, if you're fighting 4 enemies and one of those enemies has Revenge:
If you use a single target attack against the one enemy with Revenge, there is a 0% chance to Revenge
If you use a single target, single hit attack against one enemy that doesn't have Revenge, there is a 35% chance to Revenge
If you use an all-enemy attack that does one hit of damage (such as Sentinel Soulless Demon's Provoke), there is a 72.35% chance to Revenge (three successive 35% chances, since 3 of the 4 enemies can trigger Revenge for the Revenger)
If you use an all-enemy attack that does five hits of damage (such as Piece of Mind Eddie's Frenzy), there is a 99.84% chance to Revenge (3 * 5 successive 35% chances, because 3 enemies are potentially triggering revenge 5 times each)
It's very important to keep in mind number of hits as the trigger condition for Counter or Revenge when team building and when choosing skills, as otherwise you will just be causing yourself a lot of problems. This isn't a bug; this is how the Counter and Revenge system is implemented to specifically discourage indiscriminate skill usage (based on the examples above, bringing Piece of Mind Eddie in against enemies with Revenge is probably a terrible idea).
Regarding "counter[ing] [...] ally attacks", I don't know of any reports along those lines other than bugs that were solved months ago. If you have more specific details about that, we'd be happy to hear and investigate them (if they are of sufficient detail to be able to be investigated). Information about when the problem occurred (as exact as possible) and/or screenshots of the problem go a long way to investigating problems like this. "
Awesome find Nifelheim!
This is what I think is happening and why some true single attacks (meaning 1 hit per swing) get through like FFE using Hallowed Bones or Alchemist’s Transmutation. Both of which have passed the Banshee passive and killed Magus Lillith.
Most of the newer allies tend to be single target hitters with multiple hits per swing. All those extra hits count to trigger the passive.