I though my friends Ball python had been bitten

[Forever]

Today I was watching my friends Python Jake feed and I mistook the blood of the mouse for the blood of the snake. Jake unusally missed the first, second and third time. In almost a year jake has only missed once. This mouse was able to jump incredibly quick, high and far. As a result of this I already had the thought that the mouse, being as aware of what is going on at this point as he ever could be, may try to bite jake if he was to be forced into it. When jake finally caught him it was about 2 seconds before blood began to flow from either the mouses mouth which was open and touching jake while twitching/what looked to be an attempt at biting.

I suddenly realized that even if he had been bitten, I don't know what to do or not do. So I was wondering if you could give me some information regarding anything that i may consider in preventing bites or what I should do in the event that he is bitten aswell as what i shouldn't do. Keep in mind that my friend does not want to change what he is feeding Jake .