This cell, whoever they were, didn't really have a clue. Where had they come from that they didn't know about lungs and blood and-- Was he even a cell? Was he a pathogen, maybe?

But even they knew about the lungs. Especially if he was a streptococcus - but he didn't have scary tentacles or anything.

She slowed down to look at him, brows drawn, strictly unbelieving. "How... How do you not know how these places work?" she asked, blinking. "I mean, are you... Are you trying to trick me or something? That cancer cell really did manage to get one over White Blood Cell and NK Cell and Killer T, but we all learned from that."