Don't be casual about a BP's ability to bite! I got a nasty one, though I will readily admit that it was my fault. My large female was not eating the rat that I offered her, so I put my hand in th remove the rat and WHAM. She started constricting my thumb that she was biting into, and it was literally starting to go purple. Luckily my husband was around and helped peel her off.
This was fully my fault; and I learned from it and have not been bitten since. I use a trick offered from Adam Wysocki and use an empty water bottle to gently tap the snake back if she is in an S-curve, to let them know that I am not food, and it works great.
My point; while most BP bites can just be little defensive nips, this can happen. A BP deserves as much respect as any animal that can bite.. Never "aim" it at people, or be flippant about it; they can hurt!