I have been through this exact problem with my bun, a spayed female.
When I brought home the male and set him up in a separate room, she would just go nuts. Seeming to be fine, but when I got up and walked away she came darting between my feet, scratching at me. She was never like this until he came into the picture. I have been switching them into each others rooms and most of the time she is fine. It had been 5 days since they were switched (he was healing from neuter) and so last night I switched them and she was a little bothered at first and scratched me when I went to add more hay to her pile. But she calmed down and when they were switched back she didn’t freak out all around her space because it smelled like him. She used to just absolutely freak when she was put back in her area with it smelling like him lol. So I think it’s totally normal. Although it can definitely be scary if you have never seen that side of your bun before.
Detective and Senor, I’m a little unclear on your situation. Do you have two bonded buns and you brought a third home? Or did you just have one bunny (Detective) and brought home a new bun (Senor) ? If that is the case, you can’t let them be together. They can fight and injure each other. You have to go through a bonding process before letting your rabbits out together.