Vlaze wasn't going down without a fight but some of the gas that the worm have created were now used to condensed the nine dragons that are now engaging the nine clones.
He could take them back but this would definitely free the nine clones and he doesn't want to fight them, not because of their strength but because of how they fight.
Not only they have great immunity towards poison, they also have no regards to their lives making them much more terrifying compared to the Saints who were very afraid of dying.
The Saints were having a hard time battling against Vlaze, only those that have greater immunity towards poison were able to last long compared to the others.
If it weren't for Shadowslash, many of the Saints would have been poisoned heavily, Vlaze was actually furious about this, he also remember that he is the person that destroyed the Supreme Poison Clan.