3 1/2 ft normal BP eating question

I fed my Bp a live med rat like always, well while he was killing it I noticed the rat nipped the snake it is very small but drew a little blood. The BP does not act like it bugs him. I was just wondering is there anything I should do? It bled for about less than 2 mins.
How do I switch him over to eating frozen? He has been eating live since it was born.

this might help :)

http://ball-pythons.net/forums/showt...ghlight=switch

or just type it in on google or BP.net search bar

You can also pre-kill or stun prior to giving it to him as well!

Just an idea!! :D