Vader's eyes were shifting towards red-rimmed gold from his natural blue, a sure tell of his much he was drawing on the Dark side, and where his anger was.

"It should have been a concern." I should have been concerned he means. For there was none Vader hated as much as himself, and he pulled all the blame he could on himself. Even if he couldn't reasonably be expected to know - Palpatine had made sure Anakin personally had too much too do, too many battles, too many dead, too focus on it. Too much trauma to not sink further into anger, rage, despair.

"Nothing like them should exist. To be able to take away ones' will." His face curled into an infuriated snarl. "It's anti-Sith." He dropped his arm near his helmet, rolling his shoulders to adjust, before focusing on his legs. "What was the jump too far for you Tech?" He meant the your as plural, Tech and his brothers. What had pushed them to the point of leaving