Jim Schwartz threw a challenge flag when he didn’t need to and the Houston Texans made him regret it. Shayne Graham’s 32-yard field goal with 2:21 left in overtime lifted Houston to a 34-31 win over the Detroit Lions on Thursday after their coach broke an NFL rule by attempting to challenge a scoring play. ‘‘Obviously that’s a big break in the game for us,’’ Houston coach Gary Kubiak said. ‘‘But I think you make your breaks when you work your tail off.’’
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