It had to be done. Hallan was going to set himself on fire otherwise, and Brax...

Well, he saved us. [It's odd, talking about Braxiatel and not saying something catty about him. But Brax is quite probably dead, so it seems disrespectful to speak ill of the probably deceased.]

I believe neither of them had any regrets. They sacrificed themselves for Romana. As we all do.