With the strongest amongst the remaining demons being injured so severely, the rest all knew that things were looking bad. Their numbers were smaller compared to their enemies, and now, their most powerful combatant was about to be killed.
Still, they didn't despair or anything but started fighting even more ferociously. They knew that their souls would be fine thanks to the fact they were so far away from Reign, not to mention the fact that they knew he must be weakened immensely, perhaps not being able to devour any souls right now.
They were still not fully certain of that, and nobody amongst them wanted to test that theory by going to Reign, which was pretty much impossible right now thanks to the fact that they would be attacked by almost everyone the moment they turned their back to them.
In this battle, and the war for the mountain range, they were the ones that had failed.