Blue: NPC's running right through root

[Aetherial]

Specifically, seeing this in Grobb after Green when live.

A snared MOB running towards me will appear to continue running when I root it. Then the MOB disappears from my display (even though it is still "there"). If I move, I can see it again. The odd time it has died when I could not see it and the corpse was at one end of the other of the area an could not be looted.

It also looks that way to someone else in game watching me, so the issue is not related to my setup or hardware.

Apologies in advance is this has been covered already.