Sometimes things mean more than others. Emotion can be a good thing at times. I would never want a team mate that simply was playing to play & did not CARE about the outcome.
Some shots mean a lot in a match & a miss of a shot that you know was important can cause a reaction on the outside instead of the usual cloaking of it on the outside while the burn is on the inside.
Sometimes one does not really know why a miss happens & it makes one smile & 'scratch' their head.
Other times one knows exactly why they miss a shot & it was the failure to execute it properly & hence one appropriately feels the responsibility & hence the blame & true competitors do NOT like that & hence the slamming down of the cue butt on the floor.
That can spur one to be more focused & cut down on that feeling & rise to playing to a win.
Truly competing & winning can at times be a bit of a complex thing & sometimes it is as easy as pie.
Jack Nicklaus is the most 'proud' of the tournaments that he won when he did NOT have his "A" game, but still got it done.
Like a few others that have replied I don't think you get it.
This is Efren Reyes we are talking about. How often (if ever) did you see him slam his cue against the floor or show any signs of frustration when he made mistakes in his prime?
I don't think he sucks now.
It was just disheartening to see him so visibly upset at times during his match with Appleton.