jdsun1 wrote:You can't!
My best advice is to let the trades expire so the guy gets his hopes up every single day that the trade is out there meanwhile he is at a disadvantage because his worst/most droppable player is tied up in a trade offer and the next big thing gets scooped up by someone else because he was unable to drop his garbage player.
The other disadvantage is injury.
Say Papelbon gets knocked out for the season. Our friend interchange can hit the accept button and pick up two viable fantasy players for nothing.
Not the most ethical thing to do, but the guy has it coming to him.