When an opponent removes a card from the discard pile, it usually means they are trying to make a particular meld with that caronline slots that pay real moneyd. It might be wise to refrain from throwing away cards that could help them finish their hand in these situations. Holding onto any 6 or 8♣ could stop your opponent from forming a run, for instance, if you see them picking up 7♣ from the discard pile.