Well, when you apply a tourniquet to someone, you're supposed to qrite the letters TK (for tourniquet) and the time you applied it on the person's forhead. After running through some scenarios, the instructor said something along the lines of
"Okay, you've tied the tourniquet, written John 3:16 on the person's head, now what?"

I think he was implying that the patient was in really bad shape, and needed a miracle.