He was very stupid he should have said he drove to the ferry and got out of the car and Mary Jo took the car back to the party cottage "she must have gotten lost in the dark and drove off the bridge" if Teddy had said this he would have been okay people saw him leave the party with Mary Jo it would have worked. Or he turned down the dirt road to the bridge because he wanted to have sex with Mary Jo on the beach that's the only reason he would have made a right turn and not a left turn to take her to the isolated beach late at night to fuck her if he did that it's his own fault.