Only her and the beastkin have ever taken his full lust by themselves for a whole night and been capable of walking the next day. Not WELL, but capable.
Side note. I swear in the novel she knew exactly what was coming and submitted to it after he won. I don't remember it being quite this 'forced'. It was one of those 'finally finding a male stronger than her' situations that are so common in these tropes.
Also, wouldn't 777 times speed cause shockwaves from the sonic booms as he moved so fast? Even if he only moved 1 mph as base (which is implausable), he would still be moving at over the 768 mph required to break the sound barrier. And the fact that he moved so fast that even her trained eyes completely lost him means he probably moved even faster than that. I think that in the novel he moved so fast that he wasn't even a blur, just invisible to the eye.