if you've been listening to Michael Kay - he keeps pointing that out and is afraid Aaron will be next. Mike trout, Gleybar both injuries from head first slides - and Aaron keeps doing it. Someone said it's got something to do with getting caught up in between the head first & feet first since the catcher can't block the plate w/o the ball - many were originally taught to go after the catcher to dislodge the ball - guess I'll keep holding my breath every time Aaron steals or runs bases.