Look at it this way genius...
Did the Bears score? Yes. Therefore, the Lions have to expect that the Bears were planning on going for the TD, and not kneeling on the ball.
Did the Bears have two similar situations earlier, in which Jay Cutler faked the run and rolled out for the easy pass to the TE? Yes. Therefore, the defense doesn't know what to expect, and has to respect the possibility of a play action roll out. Also, it was on first down. If Cutler were to roll out and nothing is there, he can throw it away. Therefore, it can be a run or a pass (with a safety net). If it's a third down and one, then the safety net is no longer there for the QB, and the likelihood of it being a run is much greater.
Really, do you not understand this basic philosophy of offensive football?