"Sirius isn't here, Regulus. I'm sorry." He wondered idly where Regulus' brother might be at the moment. Still alive? Probably. Although it was hard to say for sure, he certainly seemed like someone looking for death. But there was no need to share those thoughts with Regulus. He had other things to focus on. This was the most interaction he had had with him so far. Maybe they were getting even closer than he had thought.

"I'm Barty, Regulus. Bartemius." And he might despise the name, but for better or worse, it was the name Regulus knew him under. "I'm here to save you."