During the humpy thing it looks as though they are biting once in a while...but I would suggest not to let the biting happen if it is hurting the other bunny. Separate them like before side by side and push both their heads down...you are dominant. Let them relax and then release them. Usually...during our bonding experience...the fighting looked like circling and biting...we would stop the session and try again another time. You don't want to let a fight to begin. I'm not sure about bonding females but I do believe we would not have had success with bonding ours until our female was fixed. I wasn't sure how to tell which one was dominant but read that the bunny being groomed is the dominant one. Good Luck and have patience.