Ok now this is a bit odd, after playing a few times I think it only happens in Exodus (act 3, mission 6 I think).
To be a bit more specific, for some reason a wing of Seraphims would seem suddenly target me all at once guns blazing and ignore everything else. I pretty much get engulfed in weapons fire and vaporized before I have time to do anything.
It seems to only happen in that one mission, Seraphims in other missions don't do this at all even if I try to intentionally try to provoke them into doing so.
I'm pretty sure it's the same wing in that mission every time, it's one of the first wings of Seraphims to jump in. It's on medium difficulty by the way.
Wierd.
