So, how is it that a person who is dumb enough to drill a root-canal with a non-sterile drill would just happen to have the one thing on hand that will treat this type of infection? That's a good question. I just happen to know one possible answer.
It could be possible, hypothetically speaking, of course, that this very same person may have, at some time in the past, become the unfortunate victim of amoebic dysentery, and that the level of suffering resulting from this experience would have motivated this wise and foolish person to obtain and possess a supply of Metronidazole from an online pharmacy in Singapore. Or Malaysia, or something. If this is indeed the case, then it would mean that there must surely be a story to explain how this person ended up with amoebic dysentery while lost in North Carolina on a mountain-climbing/Appalachian Trail-hiking trip. I will investigate, and if there is a story, I will post it some time. You know- if it's true.