Several years ago, I was hanging out at a local room, and Danny Medina walked in, looking for action. The call went out for the local shortstop, who arrives, matches up, and after 8 hours of some of the best 9-ball I've seen, broke pretty much even. No one in the room but me knew that is was Danny. It took every ounce of will power I had not to knock Danny, since he and I were not really friends, just played in one of the Stardust tournements together years ago. Anyway, net result was: Danny thanked me effusively for not ratting him out; later, when I was wondering if I'd done the wrong thing, I told the shortstop what I'd done - his words: "If you had told me, I still would have played him, but I never would have trusted you again, I don't like people who knock players". I'm not trying to say there is NEVER a time when a little help to a close friend or relative to steer them out of a trap is appropriate, only that, in general, best pool room etiquette is to let nature take its course and stay out of things unless your money is involved.