No problem. The engine is still operating. The gust lock ensures you cannot put power on the engine. The HP turbine blades are cooled.
Note that you do NOT have full AC power. ACW is provided from the propeller reduction gearbox and is only available when either prop is unfeathered (on both sides via the AC BTC).
Max ITT in H mode is 715 deg C in my copy of the FCOM 2.01.04 P1.