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He went down after 49ers defensive tackle Sebastian Valdez fell on his left leg during a drill. Linebacker Kyle Kennard and receiver Quentin Johnston also hurt.

Jake Slaughter performs well in his first audition for the Chargers' starting left-tackle role and the Mike McDonald-guided running game puts on a show.

Left guard isn't the only position battle worth watching Thursday when the Chargers take on the Houston Texans in their preseason opener.