You sit at the table, peeking over the fan of cards in your hand at the faces of your opponents. You scan the battlefield, taking in the various permanents that make up each player’s board. You ask “Cards in hand?” to the other players. You consider all of this information, taking what you know of each opponent’s deck, personality and play-style into consideration. And then you pass the turn.
“Ugh! You took forever and didn’t do anything!” Johnny untaps his land, draws his card and almost immediately re-taps his land, casting a heavy beater. Franklin reacts instantly, looking at George’s board which is packed with creatures and, noting that your board is as empty as his says “looks like you and I are the only ones that will be hit by that thing, can you do anything about it?”
“…Maybe?” is your cautious answer.
“What do you mean maybe?!” Franklin asks, “you either do or you don’t, and that thing can take you out with a couple of hits!” He gestures to his board and empty hand. “I have no answers for it! If you don’t take care of it he’ll take both of us out of the game!”
“Meh, it doesn’t seem like much of a threat to me,” you reply, allowing the creature to resolve.