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IN THIS VIDEO, for example, notice how he picks up the left foot lightly and gets it back down early - never sliding much weight on to it in any case. Also monitor the degree to which he "cocks" the bat to load it. (Only an inch or two.)
A 96 MPH fastball in on the hands, whipsawed against a floating low-away slider ... it's tough for even the best to cover both, because EVERYBODY cheats to get to a great fastball inside. (Notice Paxton's success.) It takes anticipation, a subliminal read of what's going to happen. Mikey is young yet. :- )