[Lestrade isn't going to let himself be bullied, glaring right back at John as he slips into the role of army officer.]

Yeah-- yes, we work together, and I stick my neck right out on the line letting it go as much as I do. But I'm still a damn police officer, do you know how much trouble I'd be in if they found out I let two injured people, victims and relations of victims of the perpetrator, get involved with this?

[He sighs.]

Besides, you're my friends, I'm not keen on watching you kill yourselves. So you stay here and work on clues I bring you, we have a deal?

[Sherlock rolls his eyes, opens his mouth to deliver a scathing retort, and instead finds himself having to tear the oxygen mask off and roll over to be sick in the bin. Irritating.]