I'm betting the old man got the kid in a choke hold from the rear. The old guy went to the hospital, so I'm thinking there was a struggle. The old guy may have managed to get behind the kid and choked the turd to death. And he may very well have not meant to do so.

It's really too bad that the kid didn't get away with stealing the motor. Then he could have stolen someone elses.....and then someone elses.....and then......who knows?
_________________________
Agendas kill truth.
If it's a crop, plant it.