3rd and 6. We have one guy playing outside on the right end or covering the C gap. At the snap he immediately sprints to the left side to cover a receiver there, despite the fact we're dropping 8 guys. No one replaces him in weakside C gap. In fact the weakside B defender is pushed to to the A gap. BSU QB sees it strolls for 11 yard gain.
It's defensive football 101. Cover all your gaps. It's like Bronco is so good that the rules don't apply to him.