We’ve seen this before in China, and I believe this video is likewise from China.
The CCTV footage shows a driver deliberately ram and pin what looks like a woman against a gas station filling post, and as bystanders run to assist the woman, thinking this was an accident, the driver runs out of the vehicle with a meat cleaver apparently to finish the woman off. But he acts overall disorganized and at one point appears to drink something, as if to poison himself and thus ensure he too dies after killing the woman.
Eventually, some of the witnesses approach the crazed driver and appear to incapacitate him by throwing an object, perhaps a rock, into his head.
Props to Best Gore member @boscotkc for the video: