ooc:
Peering through the hole,
Johnny first notices the mound of ten wounded and dieing customers. To the left he counts seventeen customers far away, maybe five shops away. It will take them a while to reach the store. He should be able to raise the curtain and dash out of there before any of them reaches him. Maybe they won´t even notice him...
Straight ahead and to the right, the coast is clear. No customers visible. They must have moved to where the hard core gun fire is - to the east.
The tactics worked out quite nicely.