Running back Jamaal Charles knew he would watch last Sunday’s game on the sidelines of FedEx Field. The Broncos told him beforehand that he would be inactive so they could give rookie De’Angelo Henderson a shot. And the veteran knows he could end up watching the team’s season finale from the same spot. Although coach Vance Joseph said the team has not considered releasing Charles, the 30-year-old back has certainly thought about getting out of Denver to try to latch on with a playoff-bound team. “I ain’t playing. Might as well,” he said Tuesday. “No reason for me to just sit around and look at people play. It is what it is. I’m still going to be supportive of everyone on the team no matter what. I mean, they got my rights right now.” Charles said he talked to his representatives about looking into his options for the remainder of this season and beyond.