[El Gato]

The position of the second kill would be standing right next to the tractor, which appears to be rather cold as it does not show up as brightly as the men, would be consistent with someone working on the engine. The first kill could have been someone running for a tool.

The first kill was the guy original beside the tractor, not the guy who ran/jogged over to it. He was the second. The second guy can be seen unwrapping something, rather feverously, just before the hammer falls on him. The tractor is hot, you can see a bright vertical stripe on it's left side, which would be the exhaust stack, and at the rear you can see the rear axel of the tractor is also quite warm. The engine is shielded from view for the most part.

[b4its2late]

It also looks like something explodes on the second hit and throws the perp way off to the left of the screen. Wonder if it was an RPG or something.....