Washington Redskins rookie franchise quarterback Robert Griffin III re-injured his right knee Sunday in the fourth quarter of his team’s 24-14 loss to the Seattle Seahawks in their wild card playoff game. After spraining a knee ligament a month ago, RG3 was playing yesterday with a brace and was obviously hobbled after falling awkwardly while throwing an incomplete pass in the first quarter. But he played on, until his knee buckled in the fourth quarter as he tried to field a bad snap. Questions were raised about Redskins coach Mike Shanahan continuing to let Griffin play until then, with an MRI now scheduled for the quarterback to determine the extent of the damage. Shanahan said after the game of Griffin, “He said, ‘Hey, trust me. I want to be in there, and I deserve to be in there.’ I couldn’t disagree with him.” But the coach said he’ll probably second-guess himself over the decision.