Kelerite was caught in a profound dilemma of choice, and the very premise of choice is that there are options to choose from. Now, he had options, because the Demon Lord before him was merely his disguise—his true identity being the impostor Devil King of Purgatory. Abandoning all, he still was a fake among the gods, not needing to engage in a head-on battle with the enemy.
Plus, he harbored a worrying thought: were these enemies minions of the Little Demon King, deliberately luring him out to expose himself?
But after pondering for a while, he dismissed the notion as improbable; the Little Demon King was under the Abyssal Big Mouth's command, and the Undead should be servants of the Undead Ruler—both factions were sworn enemies, hardly likely to collaborate to trap him.