Replying to Bowling injury

so me and a few buddies were bowling like 3 weeks ago - like right before christmas break. so this one buddy is awful at bowling, and cant hit any pins to save his life. so im trying to like instruct him, you know - like telling him to aim with the little arrows and whatever. so that doesnt work, so i say okay do it granny style - like when you just roll it really slowly with both hands. so he tries that, and it goes straight into the gutter. so he goes into the lane, pretending to get the ball back so he can get a do-over. and as soon as he steps onto the lane, fucking slips and bashes his knee on the hard floor. so hes like limping around and sits out the rest of the game. so we get back from couple days ago, and i find out that he had to get surgery on his knee because he like tore his mcl and fucked up the cartilage around his kneecap... from fucking bowling. and now hes out for the rest of the season. how embarassing is that