There's levels to this shit. If you have a young fighter who's winning a fight, but had a really bad round and wants to quit, you motivate them. When you have a fighter that's being completely outclassed, you get them fuck the out of there. They're either going to be ruined mentally or physically by sending them out there to get destroyed.
Roberto Duran famously said "no mas," and that motherfucker has accomplished more than any of these MMA hacks ever will. MMA, as a sport, for the most part, is pure garbage.