Sharking and unsportsmanlike conduct are inherently intentional. If the other guy was lining up for the wrong ball and the OP told him about it, in no way could that be percieved as unsportsmanlike play by a 3rd party. Just being percieved by his opponent as sharking is not unsportsman-like and if he is accused of sharking, that is his opponent's problem, not his.
I see your point but sometimes intentions don't matter. Your sitting there and just as your opponent is about to pull the trigger you accidentally drop your cue and he misses. Since you didn't do it intentionally, do you maintain you didn't shark him? Unintentional, but a shark nonetheless.
At league night I always try to be considerate of those around me. But once I walked by a nearby table right in the player's line of sight as he pulled the trigger and he missed. Went up to him after, apologized profusely and offered to buy him a drink. Of course I didn't do it on purpose and in fact he said he hadn't even seen me. But I still felt bad about it snd bought him a drink anyway.
Yes, if your opponent was indeed about to shoot at the wrong ball and you say something, that exhibits good sportsmanship. Of course. But if he wasn't going going to do that and was simply looking over his next shot or whatever, you've now inserted yourself into his process and disrupted his rhythm while he has the table. Whether intentional or not you just sharked him.
I was at the US Open 10 Ball and noticed how players rarely applaud when an opponent makes a good shot or runs out, even when a good portion of the crowd does. I asked one of them if this was because they didn't want to show their opponent any respect, give them confidence, or some other gamesmanship thing and he said no. The reason is because they don't want to do anything that may inadvertently shark their opponent as in break their concentration or focus, in the interest of sportsmanship. Doesn't matter if everyone else in the place is clapping. It is a show of respect to sit still no matter what your opponent does at the table.
I guess what I'm saying is I see both sides. If you are absolutely sure your opponent is about to commit a foul and you warn him obviously that is on the interest of sportsmanship. But the other side is equally valid. You may sit still and not say anything, also with good intentions.
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