Forget about the pain and loss of such 'helpers', Eric was afraid that even their explosion might not help him out in the current situation.
It would be a waste of efforts, as the Earth's Core Avatar had already used its terrifying Soul Energy to stop the Soul Space Self Decomposition and take the main seat in there.
Eric's plan had worked, the Earth's Core Avatar had taken over the gone Hidden Phoenix's body, but at the same time that was what made the current situation scary.
Until now they were both foreigners fighting in a collapsing space, with Eric being at the border and rather safe, while the Earth's Core Avatar was at the centre.
Eric had had the upper hand in the pervious battle between the two, but now he was going to be in a disadvantage, as the collapsing battlefield had been fixed and it was not the opponents home space.