When Harry talks to the twin of one of the bodyguards in the Raith's Deeps, his words seem to confirm that he killed the other twin and the second bodyguard in the car. Of course Harry could have been wrong and they were just badly injured. In that case I think Lara would have finished them off.
I've seen an SUV that flipped over a couple of time with several people seatbelted in their seats. While there weren't any crushinging injuries because the passenger compartment wasn't compromised, they all had severe injuries and all of them were concussed. All of them were knocked unconscious and after I pulled off the road and ran up to their vehicle, I could see all of them slowly regaining consciousness. I told them not to move and said 911 had already been called. It took a little over 20 minutes for an ambulance to arrive and none of them moved much at all. (This occurred on a mountain road near Mammoth Mountain, CA. maybe ten, twelve years ago.)
So if the bodyguards weren't seatbelted, they probably would have died. Harry only describes them as crumpled forms who weren't moving. So we can't be 100% certain Harry killed them, just say it's possible, maybe even probable, that he killed them.