I'm assuming you're talking about the legalities (since that's where this side-thread started, IIRC). In most cases, I think that wouldn't be considered a consensual fight. A consensual fight would be more if he said, "Dude, I could kick your butt," and you replied "Meet me in the parking lot in 10 minutes" then met him there and fought. Same for two guys who agree to fight for money (without it being sanctioned - so just two guys duking it out in a lot).the problem with this is there aren't many consensual fights, its tends that one is a lot keener on fighting than the other and he is just standing his ground/ declining to back down rather than consenting
so a simple scenario for consideration. ( based on a real event) I'm walking down the canal and some seriously big bozo onbig mountain bike rides straight at me, I don' mov , he swerves at the last second skids to a haltit the side of me, I call him a stupid ****, he threats to punch me, i say try it mate and see what happens, he goes to dismount and, I hit him in the face with t?he contents of a fairly full fairly hot large costa full cream latte, and then knock hm of the bike, he gets back on and calls me names as he cycles off.
did I consent to that " fight" or was I defending myself ? I could have moved out of his way, I could have apologised for inconvieniancing him, I could have retreated or just walked on, I could have waited to find out if he actually intended to punch me or was just trying to use his size to intimidated me