The moment these people were poisoned, Han Fei had already attacked.
These people were from the Hundred Demons Clan and the Undersea Human Clan. Even if they died, it didn't matter to Xia Xiaochan, let alone Han Fei. Therefore, Han Fei started a massacre.
Killing a peak-level Venerable with the strength of a king was as easy as chopping vegetables. They were on completely different levels.
However, Han Fei's Void Lines were limited. If he killed the enemies too quickly, he couldn't steal their vitality and soul power one by one. If he waited for them to die for a long time before absorbing them, the effect would be greatly reduced.
Therefore, Han Fei wasn't in a hurry.
Xia Xiaochan only killed four people. Han Fei killed four peak-level Venerables of the Hundred Demons Race on the spot and then pounced on a Half-King.
Of course, this Half-King was not easy to deal with.