Jim Harbaugh has the Chargers looking every bit like a playoff team, and their ground game has quietly become the engine driving that push. But when one of their most critical defensive anchors was suddenly spotted heading to the locker room, you could almost feel Harbaugh’s stomach drop.

Yes, Chargers star Khalil Mack exited Monday night’s matchup against the Raiders early after his left arm was caught awkwardly in a tackle. On the last play of the first quarter, Mack dove to bring down Tre Tucker , but his left arm got trapped in a tough spot between Turner and another teammate, leaving him shaken up. And it looked bad. Really bad. That’s a tough blow for the Chargers—tonight and beyond.

He looked like he knew the second it happened. The moment the play ended, he shot up and s

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