When you are being robbed at gun point, it’s a bad idea to fight your attackers. But this store clerk isn’t scared. He jumps over the counter trying to grab the gun, but fall. The robber actually has plenty of time to fire, but doesn’t. It seems he didn’t want to become a murderer.
Then the robber and clerk wrestle off camera. The second robber follows. For a few seconds all we hear is scuffling, but then they appear with the robbers begging not to be shot. It seems in the fight, the clerk got the gun, and he kicks the robbers out then calls police.