Ludo was surprised by Urgrim's equanimity: he had mentally prepared an aggrieved justification. Perhaps that would have to be saved for Grunlok. As for telling Adelbert's sister...

"Probably for the best. I just had half the lies I've told over the past year thrown back in my face with a knife to my friend's neck so wasn't looking forward to maintaining another one: It might make things more complicated fast but... was the right thing to do."