Running away wasn't exactly the style of the monsters from Guru Mountain. They would rather die with Guru Mountain than retreat a single step; that was more their style. So, their flight was merely a ruse, an attempt to lure their adversary into a formation.
Anyone facing the current problem was resolute: no matter what, these monsters had to be sealed. Various methods had been tried against these creatures, but neither blades nor fire had any effect. Kuyi Tulan had been right from the start. His decision to seal them demonstrated his accurate assessment of the situation. They couldn't eliminate the strange and aberrant things brought about by the Dark Force; their only option was to seal them.
Though pretending to flee looked embarrassing, everyone was fully on board for the sake of the final outcome. Even a stubborn fellow like Kadi was, at this moment, feigning a panicked retreat...
