49ers film room: First-team defense vs. Chiefs starting offense

KANSAS CITY, MO - AUGUST 11: Center Mitch Morse #61 and the Kansas City Chiefs face off against the San Francisco 49ers during the preseason game at Arrowhead Stadium on August 11, 2017 in Kansas City, Missouri. (Photo by Jamie Squire/Getty Images)
KANSAS CITY, MO - AUGUST 11: Center Mitch Morse #61 and the Kansas City Chiefs face off against the San Francisco 49ers during the preseason game at Arrowhead Stadium on August 11, 2017 in Kansas City, Missouri. (Photo by Jamie Squire/Getty Images) /
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49ers Preseason
KANSAS CITY, MO – AUGUST 11: Wide receiver Chris Conley #17 of the Kansas City Chiefs is upended by defensive back Lorenzo Jerome #49 of the San Francisco 49ers after making a catch during the 1st quarter of the preseason game at Arrowhead Stadium on August 11, 2017 in Kansas City, Missouri. (Photo by Jamie Squire/Getty Images) /

1st-and-10 at SF 43

The Chiefs are in 12 personnel, and are lined up in one of their common unbalanced formations. The 49ers have switched to their version of the 4-3 over front — with SAM linebacker Ahmad Brooks on the line of scrimmage — in front of a traditional Cover-3.

Andy Reid dials up a screen to Tyreek Hill, which is handled well by the 49ers defense — particularly by the highlighted defenders:

As Hill steps back for the screen, the Chiefs’ second tight end gets around Brooks, so Rashard Robinson flies up and throws his body at the blocker. Hill drops the ball — which has yet to be declared incomplete or a fumble — as Brooks fights through his block toward the receiver.

Meanwhile, Reuben Foster makes a beeline for the ball, which is laying on the ground near Hill:

Hill wants little to do with the ball on the ground, as Brooks pushes him away from the play:

Foster tries to pick the ball up on the run, but instead pushes it toward LEO Arik Armstead, who grabs the ball and heads downfield:

Armstead is soon tackled — and the pass is eventually determined to be incomplete — but this is a great example of the defense’s teamwork and attacking philosophy: