Rodolphus had been one of the Death Eaters charged with setting up the Taboo when the Ministry, and when his Lord, had thought of it.
He had only just entered Grimmauld for a visit with the newest captive - he'd always wondered how a goblin screamed - when he felt the spell breaking. Not only breaking, but this was the one voice who they'd been expecting - waiting for - hoping for.
Rodolphus beared his teeth, took out his wand. He was gone a moment later, wondering who else would be in a position to respond with him. If no one, he'd gladly kill the whelp's friends and drag him to His Lord himself.