I have found this issue to happen to my melee members when they are "inside" the monster when IWT is pressed. This causes them to run through in a straight line, and head for the horizon. If I wait until they are fully "through" the mob's hit box and a few more steps, then press the IWT key once, they turn around and stop at swinging distance.
I have removed the strobe from my teams, and instead only push IWT once, then again if anyone continues running away, when they have reached a reasonable distance from the mob.