C: You were right. Because she’s not your friend. She’s a stranger just trying to get on with her life. And I hate to question your filth-spotting abilities, but how do you even know what the substance was? Maybe it was some lotion for a skin condition? I don’t know, and neither did you, and it was wise to keep quiet and not put her through the inevitable “why is this random dude talking to me” red alert, when presumably she has an actual friend who will eventually help her.
