From Pat Borzi at MinnPost:
Manager Ron Gardenhire, faced with a barrage of questions about Nathan's sudden struggles, said Nathan "dropped his arm" throwing a nothing slider to Konerko for the tying homer. That means Nathan released the pitch lower than the normal apex of his delivery, a common mistake that reduces the sharpness of the break. A slider with little break, thrown to a power hitter like Konerko, often ends up in the seats. Gardenhire said when he removed Nathan, catcher Mike Redmond told him Nathan was dropping his arm.
Nathan vehemently denied that he was dropping his arm for any sliders to the media following the outing. As Borzi reported, Nathan told the media members that he had noticed himself doing that several appearances ago but had made the adjustments to correct that. A quick review of Wednesday's release points at Brooksbaseball.net shows that Nathan was indeed lowering his release point for several of his sliders:
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