That's how my rehabilitation efforts typically progress. A stag or cock that gets upset over me disturbing a hen, especially one going broody in the pen. You may have to watch him a little early next season but problem should be largely licked. If you had a large number of birds where time is a real issue, then culling is likely to be more effective. I would have a difficult time justifying the breaking of the man-fighting habit with any number of birds. A single bird does not hurt you but having several in a row put it you would not be worth it. Best to avoid the habit from starting.