Two OPFOR AI were walking to a waypoint. The waypoint was marked with "SAFE" as behavior and "LIMITED" as speed. In the middle of the path, an AI randomly throws a grenade and kept walking away like nothing happened. Watch the video to see the problem.
VIDEO: http://www.youtube.com/watch?v=qUZczD0QtgQ
UPDATE: There must be an BLUFOR unit stalking them to cause the problem.
I don't know exactly how to reproduce this problem. In Editor, I made two OPFOR Infantry:Sentry group and ordered them to walk to a waypoint with Behavior as 'SAFE' and speed as 'LIMITED'. Try that and watch them. Maybe stalk them with BLUFOR unit like I did in the video I provided. Sometimes they will reproduce the problem, sometimes they dont. UPDATE: There must be a BLUFOR player stalking them.
Try stalking them with an enemy unit but you must avoid getting detected. This problem may be caused by the presence of an enemy unit. UPDATE: Yes, you must stalk them to reproduce the problem.
Unable to reproduce in the latest dev build. Closing, as the ticket is very old and has not received any attention in a long time.
If the issue is still reproducable for you, please create a ticket asking for this one to be re-opened.