I never use the stare down as a psychological tactic. Fighters have to deal with tremendous mental stress for weeks leading up to the fight. By the time of the weigh in, a fighter is either mentally prepared for what’s coming or he’s not. Staring isn’t going to make any difference. 

Whenever I’m on stage I do make a point of presenting a confident look. I want my opponent to know that I’m prepared for combat. If he is unsettled by that, then it’s only because he’s in a weak mental state. Some fighters appear cocky, but that can be a cover for lack of confidence. 

By the time a fighter heads to the arena, it’s way too late to have mind games add up to anything.