The air heaved, thick and potent, and magic lashed out, almost as if to prevent Neville posing the plan. Hermione knew that it was Harry's protective instinct stirring to her defence. She felt the signature of it prickle across her skin as it flowed around her. Neville cast a Shield Charm deftly to divert the strike, and darted back to avoid the bolt of searing energy, which smashed a hole through the wall he'd been leaning against. Hermione had gone very cold all of a sudden.