How big is he relative to the size of mouse he ate? If he is getting big enough that one mouse just doesn't do the trick and he is still hungry after his feeding, then heck yes he is going to nail you on that nice tasty looking hand you offered. Other things that encourage snakes to bite you in their cage:
1. You feed them in their cage, therefore, they think anything in their cage that is warm and moving is food
2. You had recently been handling a rodent of some sort, and your hand smelled just like lunch
3. You offer him his food by dangling the mouse above his face with your bare hand, and now he thinks your hand is part of his meal.

It could be one, two, or all three of those.
Also, sometimes snakes bite, even the cutest most shy little ball python, it is something that happens if you keep snakes, especially in large numbers.
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Ball Pythons:
1.2 Normal
1.2 Pastel
0.1 Black Pastel
2.0 Het Orange Ghost
1.1 Mojave
1.2 Spider
1.0 Albino
0.1 Het Albino
1.0 Piebald
0.1 Het Piebald
Other:
0.1 Irian Jaya x Jungle Carpet python
1.0 Jungle Carpet Python
1.0 Tiger Retic
1.1 Burmese Pythons
1.1 Brazilian Rainbow Boas
3.3 Corn Snakes
0.0.1 American Alligator
1.0 Savannah Monitor
1.0 Chinese Water Dragon
0.1 Brown Basilisk
0.1 Sulcata Tortoise
1.1 Sugar Gliders
0.1 Puppy

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