No one seems to have considered the possibility that the NT overcall was psychic. Although the comical NT and the Gardener NT overcalls are not allowed in ACBL tournaments (wrongly, IMHO), a player might still psyche such a call if there is no partnership agreement. This happened to me years ago in the LM pairs. I bid my 2NT, and my expert partner (my wife--just ask her!) ended up passing me out under game. Of course, my RHO had an escape suit.