@Slid Golf is a non-contact sport unless you're golfing with some unpleasant characters. Hope your FIL is on the mend.
My niece (17 year old) broke both her wrists while hiking in a forest.
I got no rainbow color from snapping the distal bicep tendon. I probably would have freaked.
The foolish Fil fell down a slope on a rainy day and landed heavily (he has the flexible mobility of a fallen tree and the lightning reflexes of a sloth).
I would imagine the niece did much the same on a downhill stretch with poor footing.