[It's not much of a berserk button for him, but he does make a weak fist and smacks Eithan's arm as they walk. Don't be fucking rude.]

Fine. I'll teach you how to put your mana into a crystal, and you can teach me how I'm supposed to get my blood into a cup. I'm fairly sure Hiro would notice if I cut my wrist, so...

[... He'd probably get the wrong idea, too. Oh dear.]

-- Here, this room will do fine. [It's a bedroom-sized space, empty aside from dust and cobwebs and the lingering scent of smoke. Belthazar faces Eithan properly this time.]

If you want to leave now, I won't stop you.