Marcus was lost somewhere in the give and take, the bag swaying heavily with every strike, a sheen of sweat on his skin. He didn't hear the footsteps, and only slowly came aware that someone else was in the room.
He stopped, catching the bag to slow its swing as he turned. Spotting Isaac, his jaw set, and he turned away to grab a towel. "Come in to see Isolde? She's in the solarium, reading. You might catch her before she sleeps. Been tired a lot lately." He scrubbed at his skin with the towel, wiping the worst of the sweat away as he refused to look at Isaac.