Page "Blitz (American football)" Paragraph 19
from
Wikipedia
One of those techniques is called " throwing hot ," which entails intentionally leaving one blitzing defensive player unblocked.
The offensive line usually makes pre-snap adjustments so that the " free " rusher is clearly within the QB's field of vision.
When the preparedness of a quarterback allows him to not have to worry about getting hit from behind, it's one less psychological element of the blitz to be taken away, and thus blitz is incrementally made less effective by that particular element.
Page 1 of 1.
1.900 seconds.