The two of you are on an expedition, and along the way, encounter these big, pink slimes that seem to emit an unknown gas each time they jump, or you hit them. This species of slime is unknown to the both of you, let alone anyone else.

You both were too caught up in the fight to realize that by the end of it, you both had breathed in a good amount of the gas, and it was surrounding you, blocking your vision momentarily before Xiao uses his anemo vision to clear the gas.