Satan's primary tool of accusation is the bluff. If he can convince you that he's got a better 'hand' before God than you do (that his accusation will be entertained), he wins. This is a pretty loose approximation and needs to be refined. It's got potential as a skit of a poker game. I get two students to come forth and play a fake game of poker. One wagers everything, and I walk around and peek at his cards. Then I tell the other guy, "He's bluffing." Sort of like God telling us Satan is bluffing--his accusation won't be entertained.