When Luna fell silent Hermione drifted in and out of sleep. Even though she had lost Draco tonight, she was so grateful that he had saved Luna’s life. They were clearly bonded now, from the sheer force of Theo’s spells against two death eaters. Hermione thought Draco must have known it too and therefore made the horrific decision to save his friends over him - knowing Luna’s loss would drive Theo insane.