His first thought was to quietly go off by himself and cast Sending without telling Merrin.  Sort of a sheer existential reflex, there.

Then he gamed out in his mind what would happen after that, thankfully fast enough to realize that, actually, some of this was Mariona's business and Merrin would be offended by his concealment, which is stupid if he just has to tell her anyways.

He can't think of any good way to introduce the topic, so he'll simply go to Merrin after prayer and say it.

"My [divinity] gave me the spell that I would use to contact our department.  There is a small chance they show up immediately after that; and a larger chance that they show up the next [day], on their own cycle of [days] and [prayers]; after Athpechya, our executive, has a chance to request 8th-circle [Discern Location] and 9th-circle [Gate]."

His first thought was to quietly go off by himself and cast Sending without telling Merrin.  Sort of a sheer existential reflex, there.

Then he gamed out in his mind what would happen after that, thankfully fast enough to realize that, actually, some of this was Mariona's business and Merrin would be offended by his concealment, which is stupid if he just has to tell her anyways.

He can't think of any good way to introduce the topic, so he'll simply go to Merrin after prayer and say it.

"My [divinity] gave me the spell that I would use to contact our department.  There is a small chance they show up immediately after that; and a larger chance that they show up the next [day], on their own cycle of [days] and [prayers]; after Athpechya, our executive, has a chance to request 8th-circle [Discern Location] and 9th-circle [Gate]."