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I think I understand now. No contact, no foul. If offensive player trips over the leg, tripping is called on defense. If the offensive player attempts to move left or right to catch a pass but can't because he runs into that leg, that's impedeing his movement. If the defensive player uses the leg as a means of moving the other player off his spot, that's displacement. Who knew there was so much to watch for in a couple of basically stationary players.
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