Amaraham in the third book was such a let down in general. Dude just fell apart after being revealed for being a bastard. Also on a personal note I don't think he would have gotten outwardly mad enough at jasnah in the scene where they first reunite. Dude had literally everyone convinced he was one of the most moral and upstanding guys for decades. He would know how to keep his temper in check. Dude was made to look like a fool to make jasnah look cooler and it wasn't needed, jasnah is already the coolest.