The guy who was minding the shop took 2 punches square and those punches barely moved him. Surely, when this happened, the attackers must've thought, "Oh dear, this may not go according to plan."
I mean that is a nightmare scenario - you've just punched someone in the face and they barely flinch.
What's also amusing is that the attackers were happy to pocket the change off the customers. They went through all the hassle for what was probably a few dollars.
Strictly speaking, like others have said, after the wrestling on the ground started, one of the customers should've grabbed a keyboard and unleashed a series of hits on the attackers and only stopped when the keyboard itself, fell apart.
Glad to see that the attackers got what they deserved.