Frank interrupts to order everyone to the lobby, per Weaver's instructions. So they all leave, and poor Stair Master is just sitting there in the trauma room twiddling his sizable thumbs, hoping at least one of them comes back to tell him what's wrong and how to fix it. I'm surprised Luka is standing for this -- isn't it costing somebody money to leave him in the trauma room? Maybe the waiting period is some kind of starvation-diet plan enacted by a vindictive, insult-slinging Carter.