Draco was livid at remaining back at Grimmauld Place, but he’d lost the coin toss and Hermione insisted this was a mission for only two. Draco would have preferred if she had been the one to stay behind. She was the only one with a specific set of experience though. Theo was there more or less to provide a memory of events so that Draco could watch later in the pensieve. She didn’t really need him for what she had planned. Even if she was pregnant, she could still commit a couple of clandestine assassinations without a babysitter. She wasn’t an invalid.