Any calls to the area hospitals to see if the victim has/had shown up? As said earlier, "hindsight is 20/20" don't down yourself for acting how you did, because at that time your/your buddies gut instinct had taken control and were concerned about the victim.
I struggle with the thought or lack of thought about putting the "victim" into a somewhat stranger's vehicle without getting some kind of identification, and am baffled about the police not being called a.s.a.p.
I can see wanting to help the victim first and foremost but, just can't fathom how that same gut instinct wouldn't have propelled your buds to chase the mofo down and beat the f$%k out of him…maybe even drag him by his ballbag down to the parking lot. THEN call 911.
Like I said, I would have done things differently if I were first on the scene. I didn't even see the assailant, the other 2 riders in the group did.
There's nothing I would have liked more than to give him a good ol fashioned beat down, but I would have probably been too scared given the opportunity. Say what you will behind the safety of your monitor but that shit's not worth dying over, cause you never know if he had a weapon.