[BigSoonerFan]

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The exact situation went like this.

Team 1 has the Baltimore defense on Thursday. He then accepts a trade on Friday trading away BAL/DeAngelo/1st rounder for Gore/Keyshawn so that he can play those players on Sunday, kind of a 2 for 1. He does this because that week is a must win for him in order for him to have any shot of making the playoffs. Yahoo decides that since the BAL defense has already played that week they are ineligible to be traded and nullifies the trade. Team 1 loses and is eliminated from the playoffs. Now Team 2 is angry and thinks that the trade should be honored.

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You can't make an illegal trade (i.e., trading a player/defense that has already played while the others haven't). The trade was invalid and Player 2 made a mistake in not knowing this. (but who doesn't already know this?) His loss.