I don't know how this made it onto YouTube, but it's a slow-motion video clip of a jihadi paying the ultimate price for trying to kill people with a mortar.
There's no explanation of what happens, but I suspect that his initial round was tracked by computerized artillery and the return fire was deadly accurate. He should have taken off after he shot the first round, but he evidently wanted to increase the chances that he maimed or killed someone.
RLC