Sometimes a change in location can upset a bond, and being outside in spring time may have further upset things. I’m sorry you have gone through such a stressful event, but I’m glad both bunnies are OK now. 🙁
With such a bad fight and such a serious injury, you will want to give them a long time to calm down, heal, and forget the fighting before attempting to rebond them. It is possible they won’t rebond, as bunnies hold grudges and the injury was a bad one. Ideally you would house them separately so that they can’t see or smell each other for several weeks. There aren’t hard and fast rules on things, but I think starting with 4-6 weeks of total separation is a good starting point.
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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.