They're lucky that Spike is the calm and collected one, or they'd all be in trouble. Especially since he can now completely envision someone walking along only to get their face chewed off by an alien octopus.

When he hears the noise down the hall, he takes off just behind the Doctor. He doesn't slow down until they get close to the source, then it's back to listening.

"Call to it." Since he's obviously familiar, Spike gives the Doctor a look. Not that he thinks they're related, but if it thinks they are...