Former Eagles center Jason Kelce explains why Chargers QB Justin Herbert should shoulder blame for viral sack against Cardinals

In a thread, the six-time first-team All-Pro explained that the Chargers lined up in a five-man protection, which is a scheme where the five O-linemen are responsible for blocking the pass rush, while the running backs, wide receivers and tight ends run routes. 

The scheme gives a QB more targets, but it makes him more susceptible to blitzes. If a passer doesn't recognize it or hesitates, he'll get walloped. 

In Herbert's case, it appeared he didn't realize the Cardinals were bringing the house. Two defenders — LBs Baron Browning (No. 5) and Mack Wilson Sr. (No. 1) — dropped into pass coverage. Before the snap, Wilson lined up across from rookie center Jake Slaughter (No. 66), while Browning faced right tackle Joe Alt (No. 76). 

The O-linemen then switched to the nearest pass-rushers. Alt and right guard Cole Strange began blocking LB Zaven Collins before Strange helped Slaughter and left guard Kayode Awosika block defensive lineman Walter Nolen III. That created the hole for Baker and Gibbens.

For those who are wondering why Awosika didn't pick up Baker and Gibbens, remember they started behind the line of scrimmage. If a lineman goes too far beyond the line of scrimmage on a pass play, he's flagged for illegal man downfield, a five-yard penalty. In the NFL, a lineman can only go one yard downfield before a pass is thrown.

That doesn't excuse the O-line's play after it allowed three sacks in Week 1, but Herbert, a seventh-year veteran, must be more aware in these situations. The QB's failure to recognize more blitzes in Week 2 against the 1-0 Las Vegas Raiders would be costly for the 0-1 Chargers (CBS, 4:05 p.m. ET). That would also leave him battered and bruised.