There is sportsmanship, but people also have to remember this is not a traditional martial art, it staged combat, meant to emulate a fight.
Have you ever choked someone someone out or knocked them out with a punch kick knee. And been like wow that was awesome I always wanted to do that. I mean for a practitioner of submissions it is the same thing. and you never would finish that in a gym with those you train with.
It is like telling a boxer he is being unsportsmanlike for being excited after knocking someone's block off.
And letting babalu go was ridiculus, he earned a notch to me. If you are going to talk before a fight be prepared for what is coming back at you. Hell if it were football it would just be unecessary roughness.