We attempted the Terror HM last night for the first time since 2.0. On the first phase when the adds that burrow if you get too close that spawn from the terror, we ran into something we hadn't seen before. With everyone back at the edge of the exhaustion zone the adds spawn and almost immediately, when they are right in front of the boss and no one is anywhere near them, 2 of them would burrow and wipe at least one sometimes 2 raid members. It didn't happen on every time, i would say 1 out of 3 or 4 attempts. Wondering if anyone else has come across this. Is it a new mechanic or a bug?
thx