Today I introduced a new Rooster to my 7 hens. All the hens except for 2 were totally fine with the new leader. The new rooster was put in a big isolation box in our run, Then, one of my Buff Orpingtons started to get aggressive. She just puffed up and glared. Then she walked away. 5 seconds later, the leader of the flock, a Rhode Island Red,started to fight with him through the wire. They both drew blood. Eventually, it got so bad, we had to shove the hen away. That was it. Is this normal? Should I take his box out of the run?