212 - You are correct.
The issue is that when the operator uses too much collective (power demand beyond what 70/70 % PI can deliver), the Nr droops. When Nr gets below 87%, OEI TRNG is automatically disengaged. Yes, the engines are obviously driving the MGB, so there is no "smash into" and there is no equivalent to the "blow away" you mention. The EECs are trying to get Nf/Nr back to 100% by providing more fuel. What you may see, depending upon Nr and collective position, is a momentary PI/Tq transient beyond 114/114%. Without the protection of the Tq Limiter, a major overtorque would occur, potentially as high as 160/160% PI.
The OP has not given sufficient detail to explain his particular experience.