"Have you met Ivar? He's fucking crazy," Sigurd retorts even though it is a bit of a blight on his pride to admit that he isn't putting Ivar in his place for what can only be interpreted as a healthy dose of fear about the unhinged actions that his youngest brother might take against him. Ivar doesn't love anyone, much less Sigurd and there would be no loyalty if Sigurd went at him directly.

All the same, the idea is turning in his head.