Riddle Me This! 40k Rules Quiz - Episode 1

The Setup::
You have a 10 man imperial guard squad that is now fleeing from combat at the end of your turn and is now at a current size of 7 dudes.  They are approximately 5" from your board edge and about to flee off the table if you do not rally them.  You will not have an enemy within 6" at the start of your next turn.  So the Prospects for rallying are moderate.

The Situation:
Your cruel hearted opponent dumps a little bit of firepower into the squad on his turn, in his shooting phase.  He kills off 3 more of the poor already fleeing guardsmen.

The Riddle:
What will happen to the guardsmen?