Snake swallows food alive.

[D70challenger]

Hello all, First time posting so hopefully this is the correct place. I have a Mexican Black Kingsnake, he is about 22-24 inches in length. Whenever I fed him (thawed)frozen food, he would always very gently take the pinkie, would never bite it unless he had the head and would not strike. Today I fed him what I assume is his first live pinkie, and it worried me. At first he bit it and held it. After a minute, he sort of half constricted it. He held it in a bear hug for about 5 minutes, then released it. He let it go and the pinkie started walking around. Then he went face to face and bit it on the head. He proceeded to eat it alive. Luckily the defensive capabilities of the pinkie is not good but when I upgrade to mice, he may become fatally scratched internally. Even after he had the head and upper body down, the feet were still kicking and struggling. Should I continue to feed live pinkies and hope he learns to kill first, or stick to frozen?