@boomerang,
Had Dave broken his arm while rough housing with Mo, he could not have
been able to play at all. It would have been too painful to play.
I probably would inquire about his mishap and wish him well but no apologies
necessary.
My daughter had her arm broken a few years ago - also while goofing off with
other kids. It happens. At the Children's ER there was almost an assembly line for taking x-rays and getting on casts - I couldn't believe how many kids came
in with broken arms, wrists, legs....
Just wish Dave well and leave it at that!