I have no idea what "bottom rudder" means, but I imagine it has something to do with his bank, ie, yawing in the direction of the bank. That seems like a snap roll to me. The renders on the show are often inconsistent with what the pilot is saying, compared to the other accounts I've seen.
Caspar makes a good point about the scene at 23:00. If anything, the P-51 pilot made a huge mistake by getting slow enough to stall, exposing him to an attack. Pure luck saved him.
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