Every Sunday, Boston Globe photographer Stan Grossfeld asks the subject of one of his photos to explain what's happening in the shot.

Who’s up today: Marine Staff Sgt. Daniel Bear of the US Southern Command was tagged out at the plate by Marine Lance Cpl. Matias Ferreira, the catcher for the Wounded Warrior Softball Amputee Team on Dec. 8, 2012. Ferreira, who lost both of his legs below the knee in the war in Afghanistan, blocked the plate.