“I tried not to inject any into your bloodstream. I don’t know her blood type. I actually don’t know yours, either. If they didn’t match, we could have caused a deadly hemolytic reaction, like when a blood transfusion goes wrong. But, since I squirted some at you, some of that blood stayed on the needle. And since I used that needle to create a fresh wound—the injection—the likeliness of you contracting HIV…”