The man was stocky and grizzled, with receding grey hair and a cold gleam in his eyes.
"Good morning," he said, his voice low and even. "Professor Dumbledore has contracted me, and some ... associates ... to lend a hand. You've got a Dark Lord to worry about, and he wants you lot prepared to deal with his minions."
He stepped to the lectern, and opened a battered tome. "We'll begin with an inspirational reading, from a time when my associates and I dealt with a similar situation. In those days, the Black Company was in service to the Syndic of Beryl..."