It must have been a long night for Snape. He had to investigate Harry’s coded message. He had to patch up members of the Inquisitorial Squad without letting them know their family members were in a battle that would determine his future and theirs. He had to hold Hogwarts together as the senior administrator with Dumbledore, McGonagall, and even Umbridge out of commission. He had to know what was happening from both sides, hide what he knew for the sake of the students, remain immobile, and wait.