Poison was the hardest thing to guard against in the world.
It was worth noting that the Insects were known for being poisonous. The lizards here were not considered one of the 5 poisonous creatures but being part of the Insects, their toxicity and resistance toward poison were notable.
Therefore, they would not have imagined anyone to use poison against them.
Besides, what was the time now?
High above the sky, 2 powerful Venerable Ones were having a life-or-death fight, whereas the lizards below were captivated by the fearsome momentums that surged down. Given the situation, even the most alert lizard would not have thought that someone would have the guts to attack them.