Neither Meng Die nor Barefoot Immortal had any understanding of Rosen in the darkness; they couldn't see Rosen's appearance at all, so they remained cautious of him.
Barefoot Immortal said, "To easily distinguish each other's identities, I've decided to add my own pheromones to you all, so that we won't mistake each other in the future."
Barefoot Immortal is one hundred percent sure of his own pheromone resolution.
"Wait, you don't mean to use your foot grime to add pheromones to us, do you?" Rosen asked in horror.
Barefoot Immortal looked confused and asked, "How did you know? Looks like you know me quite well?"
Rosen found it odd too, right, they clearly didn't know each other or their identities, so why did he mistake him for Barefoot Immortal because of his smelly feet?
