How do you fix doing what he did on that play? Slide headfirst, pop up slide, slow yourself more in the process of sliding(especially since he clearly stole the base), etc Sliding head first is bad for the most part and I'm not sure players can situationally decide to slow down in that position. Pop up slide maybe but there's still a chance that you come off the bag. I file a play like that under, [expletive] that happens in baseball and nothing that can be completely fixed. Thank God Arietta didn't just die.