Blaise flinched at every curse. Compared to how his duelling lessons, this was an all-out war. He could not understand how Professor Snape could be so calm. The teacher merely stood in a corner, wand at the ready, but not interfering beyond the occasional shield to keep them safe from stray spells and curses. At his pupils questioning look, he merely shrugged. "Better for them to get it out before the meeting."