Nope. Nothing is wrong. Nor is he aggressive.
He smelled the mouse and thought your hand was prey.
Your hand probably smelled like the mouse too.
Being out of the hide doesn't necessarily mean something is wrong. Balls are nocturnal so they're more active at night. If you notice anything else abnormal, then perhaps it may be time to worry a bit. Really active balls may mean they are stressed.
And having a separate feeding enclosure isn't necessary. He won't develop cage aggression if you feed in the main enclosure.
I've been feeding a number of balls in their tubs and they're still docile puppy dogs.
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