"Sentenced you... to go to -- you went there, didn't you?" God, it was like Barty all over again. Why did everyone he loved just decide to go to fucking Azkaban as soon as he died? Regulus put his head in his heads, furious and frustrated but trying to keep it all school in so it came out more as resentment and annoyance. Peter Pettigrew.

He was alive, he was with the dark lord and Regulus was going to have his head. He would discuss it with Barty first chance he got. He didn't even want to think about the suffering Sirius must have been through. "Explains why you look so shattered."