Are you sure it is a taurus and not a rossi?
Early Rossi rifles could be pump fired but they put a disconnector in place several years before Rossi and Taurus integrated with one another.
Maybe Taurus brought the original design back or there may be a fire pin lock now incorperated into the gun that prevents it from actually firing if the shooter attempts to pump fire the weapon and you will have to recock to actually fire the shot.
Did you attempt your experiment with live ammunition or were you playing with an unloaded gun?
I can't give a definitive answer because we don't repair Taurus guns, one breaks we box it up and send it back, the Warranty Service is excellent.