They didn’t fight because they are un-castrated and were more concerned with mating. At 8 weeks she is probably not able to get pregnant yet, so that’s good, you hopefully won’t end up with an oops-litter. Rabbits can mate in a flash, even through cage bars. The way rabbits normally mate is the female enters the male’s territory, so no surprises there.
Absolutely doo NOT let them meet anymore. Right now his attraction to her is purely for mating purposes. It honestly might be best to move her into a secure room, out of his sight for now. Once he is neutered and she is spayed you can resume their side-by-side living arrangements. I would also add a roof to the pens to prevent this from happening again (a sheet clipped to the top works great).
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.