He hit the throttle when he should have hit the brakes
Now here's a guy that probably should have never purchased a motorbike in the first place. The video starts off with a typical Russian dash cam rolling when the motorcycle and its rider appear from the right hand side. As he approaches the stop sign he attempts to brake, but it looks like he hits the throttle instead. This jolts the bike forward right as a semi big rig is barreling by. The rider drives himself right into the back wheels of the semi and the motorcycle is instantly pulverized. For a second it looks like the rider is as well, but he walks away from it.