Totally scientific. Laboratory conditions. Quite literally...
[Flashback to Sherlock monitoring John as he runs from the 'hound' earlier in the episode]
[whispering] He's in here with me...
Alright, keep talking. I'll find you. [pause] Keep talking!
I can't, he'll hear me...
Tell me what you're seeing!
[Sherlock puts his phone to a mic and sends a vicious dog snarl over the intercom.]
[Shuddering] I don't know, but I can hear it...
[In the present] I knew what effect it had on a superior mind so I needed to try it on an average one. [John stops eating and looks up, insulted.] You know what I mean.
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