You hold your spear up and wait for the big one to attack, but it simply continues to watch you both. When it's evident that neither one of you is about to attack the other, the lizards all seem to relax slightly.
The young girl pulls on your spear, indicating for you to put it down. There are too many of them, and it seems they don't want to kill you right away. You're not sure why lizards would take prisoners, but this has hardly been a normal day so far.
The lizards surround you tightly and begin herding the two of you out the gate that they had entered by. As you walk, you see lizards gingerly pushing dead companions that are severely bloated and stinking of methane past you, into the city. You realize with horror that the lizards have somehow figured out how to leverage the corpses of their companions and turn them into bombs!
A few minutes later, the entire tunnel shakes as you hear and feel the city cavern behind you collapse.