DERUY is not 34/12.

Look back on it and tell us what "read" led you to think you were behind. Since there were virtually no bets you must have an electronic tell. (Most of us make our reads via evaluating the action and using our experience to narrow the range of our opponents hands). If you had an electronic tell (say the way the alarm beeped to warn you time bank would be activated was a couple of decibels higher than normal) then lay it down by all means.