People also forget or ignore that the field was probably a mess. The game had already been delayed for over an hour for rain, though I'm not sure if it was raining at the time. People slip all the time on wet fields, his just happened at pretty much the worst possible time.
Also has to be huge to know he doesn't have to pitch deep into games. It's far easier to let it loose for 10-15 pitches and have a day or two off, than it is to prepare to pitch every fifth day, expect to throw 80-100 pitch and last all year. I just hope this keeps him healthy.