"For sitting on the ground, or for breaking my bottle of broomstick polish?" Zacharias inquired as he watched Merlin dust himself off. He sughed and offered a hand to haul him up from the ground before he got bowled over by a band of rushing children.
"I'm sure the ground is comfortable and all-" He was sure it was not. "-But you ought to be more careful," he admonished. He could have been much more rude than that, but the bloke seemed awfully dazed and it wasn't as much fun - like dueling with someone who was unarmed.
"What's your name?" he asked him, looking him up and down. He looked vaguely familiar, which told Zacharias he had probably gone to Hogwarts. But not in his year - probably not one year apart either. And not in his House, he'd reckon.