Saleen stopped absorbing the black mist after seeing that the eye of the black vortex was about to show. He had no intentions of dealing with the vortex in Fycro's stead.
He was almost set up by Fycro by helping the holy masters deal with the abomination problem. If it had not been for Rafel the archangel, Saleen might have ended up falling into Fycro's trap.
Saleen did not bring Rafel along this time. Fycro apparently had his eyes on the Floating City, so Saleen was compelled to leave his most powerful subordinate to guard the place. While it was true that the Floating City itself was near-invincible, Saleen had to be careful.
There were many peculiar skills in their plane, enabling people to control the minds of others.
"Master, are we going to leave or not?" Nailisi looked at the remaining bits of mist and huge black vortex, feeling rather reluctant.
