I practice a martial art/sport called Brazilian jiu jitsu or BJJ for short. By all accounts it's a pretty violent sport. The aim being to score points by putting yourself in advantageous positions and your opponent in disadvantaged positions, but ultimately to make them submit by putting them in arm-bars, chokes and other moves that cause pain. Is the intention to cause pain by performing an arm-bar or whatever akusala? Of course oftentimes the pain is unintentional, but when you are going for a submission you do intend to perform a move that you know causes pain.
"If beings knew, as I know, the results of giving & sharing, they would not eat without having given, nor would the stain of miserliness overcome their minds. Even if it were their last bite, their last mouthful, they would not eat without having shared."