Walking behind him, your hand slightly trembling with the knife gripped in your paling knuckles, you inched forward, not even daring to breathe lest you alert him. Almost two steps behind him, you placed the knife on his back, right above where his heart was supposed to be, and uttered as coldly as you could.

"You twitch and you die."

You saw the muscles in his back stiffen, one by one, even before you had spoken.