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...a cutter would have the affect of inducing a lot of cheap ground outs if you were cheating to catch up to the slightly faster fastball. Picture stepping it up to make sure you hit the 94 fastball, getting the 91 cutter and being out in front but still making contact because the difference isn't that great. They are indistinguishable to the batting eye...yo can't adjust to a cutter. At all. So you roll over on it and bounce out to second a lot. I think that's what may be happening to Langerhans on cutters.