Thankfully I never experienced getting shot, and probably never want to. At one point I was going to sign up for the armed service but my ankle stopped me from doing that. I can concur the powers of adrenaline. When I was back in high school I was a pretty serious soccer player, and ended up shattering my ankle the worst way imaginable, according to the doctors. I remember hearing a very sharp and loud popping sound as I face planted onto the ground, and thought to myself that I had just snapped my shin in half. I rolled over to look down, that's when I noticed my left foot actually pointing left, and the bone from my ankle, coming out of the skin pointing RIGHT, I though to myself, well something doesn't seem right here...
It never actually hurt, and they said I was never in shock. My friend called 911 and I laid there laughing and cursing about it. The paramedics asked me if i consumed any alcohol or illegal substances, I said no, because I didn't. He then turned to me, and said "how the f**k are you laughing then?" I said it doesn't hurt I don't know.
Long story short I ended up shattering my Fibula (smaller leg bone) and breaking the end of it off that holds your ankle together, that was the bone I saw coming out of the skin. I cracked the Tiba (bigger leg bone), dislocated the ankle since I broke the end of the Fibula, and managed to tear all the ligaments and tenants. Now I have a metal plate and 8 screws residing in my ankle permanently.
This doesn't really compare to getting shot, but can go to show that adrenaline is very powerful stuff, and until that day, probably never understood just how amazing and probably life saving in a different situation than a broken ankle it can really be.