Try

"D-Donnie-"

"Just get out." Donnie's voice is quiet again, his hand shaking as he picks up a paper. "Get out and let me figure this out in peace."

Something rises in the leader, similar to the gut instinct he gains when his team is about to walk into a trap, or there's a danger lurking just out of sight. He knows that it would be easy to leave, to obey his stressed younger brother and allow him to continue his work.

In a way, this had been what he'd wanted, hadn't it?

But this is wrong.

Donnie had left during their argument a few evening before. Left on a horrible note of blame and anger and stress that hadn't faded. His little brother may not have realized it yet, but they needed to remedy this or it was only going to get worse.

Leo started this, and now he's going to finish it.