He had a wind from the right which helps in a right power pedal aircraft. = stable so far
He planned to yaw left to align with the pontoon putting the wind further round. = reduction in right pedal to yaw left
When he attempted the go around, his yaw pedal position was very far behind where it needed to be and then he got weather-cocked to downwind and panicked. = needed enough right pedal to stop the original yaw and more to compensate for the handful of power pulled.
I don't know what Tq warning indications there are on the 120 but the Gazelle had a red flashing light that then went on steady.
In this respect I agree with Megan than concern about overTqing might have prevented him using full right pedal.
So instead of a mild overTq taking a couple of hours off the transmission - he crashed the aircraft instead!!!!!