Potter, like the idiot he is, simply tries to talk to Shacklebolt, as if some polite words could stop him or the Aurors’ assault he has planned against the barrier. It reminds Theo of the Battle of Hogwarts, when the Death Eaters started to break down the wards that protected the castle until they cracked and let them in as Theo ran around the castle with Draco, trying to destroy the diadem.