Torque limiting on the 412HP/EP is different to that on the 212. The TCU (torque control unit) on the twin-pack installation of the 212 will prevent you from overTQ'ing the transmission (with both engines operating), giving you rotor droop instead of overTQ. The 412's twin-pack will keep giving you the power demanded of it, to a point past the mast overTQ limit.
When the mast overTQ warning light is triggered maintenance action is required prior to further flight. Depending on the degree of overTQ, a complete factory overhaul of the power-train might be required. For a brief transient mast-TQ excursion only an inspection and re-setting of the overTQ "doll's eye" is required.
I dare say that if the ship was slung back under a Chinook then it's going to be because of something substantially more expensive than a transient overTQ.