I had time to kill them all without taking significant damage. This is not the Rainbow 6 damage model for sure. I rescued a hostage from a room of gangsta's. When I freed him he jumped up and ran away. A natural reaction to be sure, as I am not that sweet to look upon.
Dumb people deserve to die.
This brings up another observation. Bad guys don't seem to react to sound. I capped three guys in one room, went next door into the bathroom and 3 of them were in the stalls. They never came to investigate. Not very real.