Michael Crabtree extensively blocked Aqib Talib out of bounds and to the ground, and it led to a brawl between other Raiders and Broncos players. Talib and Crabtree have a history with each other stemming from when Talib ripped Crabtree’s chain off.
Talib and Crabtree both swung at each other and were ejected from the game. Gabe Jackson, a Pro Bowl offensive lineman for the Raiders, was also ejected for contact with an official.
UPDATE: It appears as though Talib snatched Crabtree’s chain again at the outset of the dispute:
"HOW DID CRABTREE GET HIS CHAIN SNATCHED AGAIN??? pic.twitter.com/suDjjzwjtk"- — Barstool Sports (@barstooltweetss)
At the end of the fight, Marshawn Lynch played peacemaker, escorting Talib out towards the locker room: