I backed away, closing and warding the door as a hailstorm of spells ricocheted around the hallway and a series of bright-orange spells slammed in a series against the door. There was an eerie thrum as each one hit, slowly tearing down the defensive wards Severus had laid into it. Putting both wands in my right hand, I cracked open the door and cast the strongest Confringo I could manage. The explosion was nearly deafening, and there was no return of wand-fire.