Halftime observations: Chiefs 20, Chargers 10

It’s halftime at Qualcomm Stadium, and the Kansas City Chiefs lead the San Diego Chargers 20-10 on Sunday. Here are some quick thoughts.

1. Tight end Travis Kelce was missing in action for the Chiefs’ first possession. He just stood on the sideline, with his helmet on, during the opening drive. He returned on the second play of the Chiefs’ second drive, which began in the second quarter. A team spokesman declined to comment. We’ll ask coach Andy Reid about his absence after the game. Should be interesting.

2. Alex Smith scored on a 5-yard rushing touchdown in the second quarter, giving him five rushing scores for the season. That ties the most ever in a season by a Chiefs quarterback,…