Defenseless run?

[CarrotBubble]

Hi dudes, I was hoping you could help me with a little problem I'm having...

So, the thing is, when your unarmed unit (ie. unable of attack, sheep for example) takes damage from an enemy unit, in runs a bit away from the attacker.
This pisses the hell out of me, can I prevent it somehow?
I.e. I want the unit to stand and do nothing when enemy attackes it. Is it possible?

edit: crap, not sure if this is in the right category :|