I had similar situation back in the winter. I had waited about 7min(>) for friend of mine(50m> away) to stood up a little bit more so I could take clean body shot. Sadly he didn't and when he started aiming at me I took the shot. Aimed at the upper part of the chest but bb hitted him at lips. Luckily no tooth were injured.I've also taken a friends front tooth out at around 40m,after waiting for about 5min to take a body shot, he raised slightly higher over the banking so i took the shot but it went high and hit his top front tooth,which came clean out.