Keeper of the Lake. The GNB was clearly new to game and tanking... She was grabbing aggro by using her 123 combo on each mob but since that wasn't enough she kept losing aggro.

I haven't played GNB in months and wasn't sure which was the starter AOE(Slice or Slaughter) for it so I took a guess "to aggro all, I think you need to use Demon Slice". Turns out I was right because she started using it right after.