[Even at a safe distance, he still positions himself so that he can see into the subway tunnels from where they stand. Just in case anything decides to wise up and actually travel out of them for once...]

Nooo idea. I mean, vines, obvious, but I dunno why they're acting like something out of a horror movie. It's a good idea to avoid that area for now, though. There are super giant rats down there, too.

[Just in case sentient plantlife wasn't horrific enough!]