There is no longer any bridge too scorched to walk across; Mike Shanahan is interviewing with the Oakland Raiders. Forget that it might be foolish for NFL teams to be interviewing a 62-year-old coach who has won one playoff game over the past 16 NFL seasons. This particular combination is about as unlikely as it will ever get. Shanahan spent most of his career with the Denver Broncos taking shots at the Raiders, who fired him just four games into the 1989 season, his second as their coach. And Shanahan spent a lot of time beating the Raiders too. He went 21-7 with the Broncos and enjoyed every win. It wasn’t too hard to get him to take a sideways shot at late-Raiders owner Al Davis leading up to those games. Shanahan for years claimed Davis owed him $250,000 from his contract. The Raiders claimed Shanahan actually owed them money . If Shanahan and Davis really liked each other behind the scenes, they put on one heck of a show for the media for a couple decades.  There’s a story that Shanahan ordered 49ers quarterback Elvis Grbac to throw a ball at Davis’ head during pre-game warmups when Shanahan was San Francisco’s offensive coordinator, and Grbac just missed him. Or, it was Steve Young who threw it and he hit Davis in the leg. Either way. Not only had the Raiders and Shanahan seemingly burned the bridge between them, they took the ashes, put them in a can and blew those up. Or, maybe not. Shanahan, out of work since being fired by the Washington Redskins after the 2013 season, is interviewing with Oakland according to Dianna Marie Russini of NBC4 in Washington , ESPN’s Adam Schefter and the San Jose