Poor guy. Well you did warn him so perhaps now he'll have learned albeit the hard way. Make sure he keeps that wounds clean Ed and I assume you made him wash it out really well. Rat bites can get nasty fast.

If I have a difficult mother and I need to get at her offspring or clean her enclosure I just quickly tail her and move her to a secure container that I'll have already set up right beside her enclosure. Takes about 2 seconds and I can't remember the last time a rat nailed me (which means of course I'm about due for a bite doesn't it LOL). Most of my females are handtamed enough that they don't mind me around their babies, but you do get the occasional overly protective momma rat. As long as they are normally placid in nature then I don't mind that....if they are nasty by nature....out they go!