Most are in there going for strength and tenacity to beat their way through it, but some are in there enjoying themselves with glances,moving in on punches early,even moving into a spent punch to spoil their position, blocking with elbows which hurt the other guys wrist then going straight up from there, sometimes realizing that one side isnt hurting them and is no threat anymore, so they move in and choke off the threating side and then punish them up the centre etc . It can be fun if your evenly matched or better.look at Morrales and Barreras old fights they had a ball in there.