They were throwing some kind of explosives at the police, so one probably didn't get thrown as far away as they would have liked and the dude caught some shrapnel. There are several witnesses to explosions, including Michael Nystrom I've heard, and there are eyewitnesses that say they saw them throw explosives, one guy even said he saw them have what he thought to be another pressure cooker bomb.
Just saying. I think it's very possible they shot him after he was run over and good as dead already. But I also think it's possible he had shrapnel in him from whatever the explosives they had they were throwing at the police.
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