I don't think anyone has an issue with him returning to the field with what ostensibly looks like an engine failure (albeit an explosive one).
It seems that he didn't shut the engine down - just set it to idle - and then subsequently noticed the fire and banged off the bottle. Although it seems the idle N1 would be too high to allow the bottle to discharge.
Elements of the tail boom/TRDS could have been damaged by the engine trashing itself and it might have failed anyway but why didn't he shut the engine down completely?
If he had put it to idle, checked the indications (he said he did this) and then completed emergency shutdown - we probably wouldn't be discussing this as the fire would hopefully have gone out and he would have made a safe OEI landing at the field.
One of the videos shows he flew for over a minute before the tail boom failed - more than enough time to secure the engine properly.