Thinking fast, I used the Elder Wand to cast Incarcerous on everyone in the bus, hoping that would be enough to protect everyone. Severus cast a bubble of protection around himself and the unconscious Draco as the pavement became visible through the windows on the right side, and I heard muggle vehicles slamming their brakes and honking their horns as the Knight Bus finally became visible to them, crashing onto its side as it was rear-ended and the glass shattered all around us.