Blood in the pool

I went in for an easy friday swim workout, and decided to practice flip turns in the pool. I pushed off the wall and came off crooked. I was in lane 1, where there is a ladder about a body length from the end of the pool. I went head-first into the ladder. It hurt quite a bit, but I finished my workout. When I got back to the locker room, I noticed blood on my forehead. Apparently I was bleed in the pool for at least 15 minutes without anyone even noticing. Glad the lifeguard was being aware of what was going on.