Counter proposal: all of the terms of the narrative concession plus Sanger lands a good hit on the Day Caste.  Maybe they do the whole stand apart, examining each other then strike simultaneously thing.  Details are up to you, you can take narrative control of Sanger to make the scene look cool.  But I'd like to land one smack on the Day Caste, something for it to remember Sanger by.  Don't even care if it has absolutely no mechanical effect or damage goes away the next day: this is purely for the sake of my ego and because I think it'd be cool for the narrative.  But won't lie, ego is a significant part.<br/><br/>And of course Sanger rescues Samaro too, because that's what Sanger does.<br/><br/>Amendment: Sanger also takes a glancing wound, and while struggling with the poison, carries Samaro on his back to the portal.