Sagramore is here because the idea of not having eyes on his husband right now is unthinkable, shading into terrifying -- he is, frankly, too far away. They should be shoulder to shoulder the way they were for the zombies. He's cognizant that he serves no practical purpose either here or in the library with Laertes; he has no magic, he hasn't got Claudius' mind for scheming, and he's only middling in combat. All he's here to do is watch.

He's been worrying at his pendant more or less constantly since he arrived, and he's dying for a drink. While Laertes was still around during their preparations he was projecting an aura of seriousness but confidence, but now he's an obvious wreck; he keeps pacing and returning to the screen and then pacing again.