I'm surprised people would worry about whose fish it is. If I was in that situation, for sure I would turn the rod over to the other guy, but knowing my fishing partners, they'd insist I bring it in. There are enough fish out there for everyone. When I get out in the boat, I'm just happy to see fish get caught, doesn't matter if I'm getting them or my partner. Maybe the fact I don't keep/eat fish has something to do with my attitude, but I'm perfectly happy being the net guy