Well on the 'Bus if the AP is in and the FO pushes the levers forward it's going to go-around which would be difficult to recover from and continue an approach so best to just go with it (the go-around). Again on the 'Bus the FO can hit the takeover PB on his sidestick and lockout the Capts inputs and initiate a go-around.
In both cases, at least the aircraft is now climbing away from potential disaster - then it's down to the Capt and FO to "discuss" the next course of action......
"Captain, you MUST go-around!" - if no reaction INTERVENE.