Not sure if you are being serious here or not, but I will play along any way. A player coming free from a stunt or twist in a QB's line of sight is a little different than a player beating his man and causing pressure. The difference is a player beating his man is much easier for a QB to manipulate by side stepping, or stepping up into the pocket. A man coming free is computed much more like a blitzer, which the QB recognizes as "there has to be a weakness from where the player is coming from" and I can beat the defense by throwing to that area. The act of self preservation causes the QB to have to make a snap decision and get rid of the ball to an area he HOPES is open, due either to his progression, or to him mistaken the free rusher as a blitzer.
QBs hate taking sacks, and will too often make bad throws rather than eat it.