A killer gets chased out of a restaurant, he comes back with a grenade!

In Serbia, an attempted murder was captured on restaurant security cameras. The video shows a man with a gun approaching a customer who is eating, and pointing his gun at his head. But bad luck for the killer, his gun jams and he decides to flee. Just as we think that the action ends there, the killer, apparently furious, comes back armed with a grenade, which he throws randomly in the establishment...