"You aren't interrupting," Regulus replied, turning to Gaius. "You are just in time to meet my first employee. Barty, this is Gaius Snape. He is designing the interior of the shop for me. Gaius, this is Barty. I've just hired him."
While they got acquainted, he took the humming, glowing needle from Gaius and examined it, trying to remember exactly what the thing did.