A Crazy Theory
After thinking about it, I find it hard to believe John can beat Orrin while he’s in Sera’s body. I think the whole point of this event is to set up Cameron’s intervention.
It’s definitely possible since Cameron has been tracking John, and several days have already passed, so his arrival would make sense, unlike what happened during the Wellston raid.
My theory is that John and Seraphina will end up in a brutal, exhausting fight. Once Orrin feels that John has been worn down enough, he’ll try to force Sera to kill herself. At that exact moment, Cameron will step in, sever the connection using his Barrier, and with the combination of Barrier and time manipulation, he’ll easily break through Orrin’s defenses and take him out.
I think this moment would completely amaze John and make him realize the full potential of his own abilities, motivating him to train under Cameron afterward.
The only thing that honestly worries me is the Bureau members. I’m not sure what role they’ll play, but I don’t think they’ll witness Cameron, or maybe he’ll eliminate them early before they can recognize him. From a story perspective, it makes more sense for Cameron to remain hidden.
I know this theory sounds crazy, but I’d honestly give it about a 50% chance of happening. The only other possibility I can see is John and Sera somehow breaking free from Orrin’s control, but I don’t think that would be nearly as convincing as Cameron stepping in.