Zachariah glowers, than snaps his fingers at the help staff, pointing towards the balcony. "Your brother will do no such thing. I should never have left him with you without supervision, Winchester. If you have so much as breathed too hard in his direction..."

A simple diversion of course. Zachariah had counted on Castiel going into heat - just preferrably in the presence of a better alpha, one Zachariah could push him into choosing, one who could sign a contract on short notice, breed the bitch right away and apply a biting mark. What better way to get this show on the road?