You're well enough to argue, I'll give you that.

[John sighs, looking him over. The doctor in him doubts someone with a punctured lung can just walk home in this condition, the sane part of him knows doing so is a bad idea, but the last part of him, the part that is John, Sherlock's friend, that part knows this stubborn, utterly ridiculous prat of a flatmate won't recover if he stays here. As always, it wins out.]

I'll have a word-- but if you get worse, I am asking someone to come round, and you will let them help you. I want your word on that, Sherlock.