I really do think it has something to do with the mobs ability to stomp and pull... my guess is their code is missing the full checks in it for statics like the players have when they run/walk.
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I love being pushed off a map I've done it several times on purpose in ao2 and 3 and occasionally in the swamps so we can jump the bosses and since the bosses can't buff at that point they die in 3-10 seconds