ALAN TYANI
You cannot be able to prevent a person from throwing a handgrenade by running away.  As far as I was trained you cannot run away from the handgrenade.  It depends on the expertise of the person throwing the handgrenade.  If he is an amateur he can be able to detonate it and get it to explode before the delay.  If you try to run away it means you are more similar to a person committing suicide.  What you can do is to take cover in that kind of a situation and face the grenade with the lower part of your body but that will also depend, the shrapnel might come straight to you.