I had just started carrying my Spyderco endura in my left pocket as a backup defense knife. While working the late night shift the dispatcher asked me to man the radio and phones while he hit the head. I though what a perfect time to practice my edge-up quick draw. I had done the draw about ten times perfectly and decided to speed up the motion. I'm still not sure what I did wrong but I felt my thumb hit the edge as I went to a fighting grip. I looked down and could see a large flap of loose skin on my thumb, with blood everywhere. I thought "This is bad!" I went to push the flap down and it fell off, leaving a dime sized hole in the side of my thumb. "This is very bad!" I realized I could not leave until the dispatcher returned and all I had was some tissues to stop the flow. "This is getting worse by the minute!" When the dispatcher finally returned he found me with a baseball sized wad of dripping, blood soaked tissues around my thumb. He absolutely freaked! He wanted to call out the entire aid unit. I talked him out of it and had the on-call doc bandage me up. Oh yeah, I forget the flap of skin on the floor and the disaptcher wouldn't touch it, so he just stared at it the rest of the night until the next guy came on and trashed it.