Los Angeles Chargers wide receiver Keenan Allen (13) runs the ball against the against the Baltimore Ravens during the first half at SoFi Stadium. Gary A. Vasquez-USA TODAY Sports

Watch: Chargers get tricky vs. Ravens, convert first-down with backward pass from WR Keenan Allen

The Los Angeles Chargers broke out their bag of tricks against the Baltimore Ravens, pulling off a complex play to keep a drive alive on "Sunday Night Football." 

Trailing the Ravens 13-3 late in the third quarter, the Chargers dug deep in the playbook to convert a third-and-17. First, quarterback Justin Herbert delivered a pass over the middle to wideout Keenan Allen, who tossed the football backward across the field to dashing running back Austin Ekeler, who scampered past the first-down marker.     

Ravens head coach John Harbaugh decided to challenge the play, but an official review upheld the ruling on the field. 

Unfortunately, the Chargers' out-of-the-box play call didn't end up mattering. Despite moving the ball to the Baltimore 16-yard line, things ended with a thud. 

On the 19th play of the drive, Ravens edge rusher Jadeveon Clowney recorded a strip-sack on Herbert, and the Chargers came away with nothing.  

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