When the explosion goes off we get a few shots in slow motion of the shockwave ripping through the ground and an old abandoned vehicle. The blast is dusty and grey in contrast from the gorgeous reds and yellows we usually see in movies. The explosion is enormous and Thompson can't out-run it. The shockwave from the blast pulverizes the sergeant, crushing his vital organs, killing him. His death establishes the high stakes his successor will have to go through in the film. "You are now in the kill zone."