Remus wasn't going to say whose fault it was one way or another until they heard from Cass and Susan. If she wanted to focus on Bellatrix (which Remus heartily agreed with), he wasn't going to tell her any differently. She needed some place to concentrate her anger and if it was Bellatrix, so much the better.
"I'm over forty," Remus said with a rueful smile. "I still say that I am." That, however wasn't helping matters.
"Go ahead and cry," he said, arranging her near to his shoulder. "No one is ever meant to die this way."