Having just participated in a rescue mission that freed two captured people from one of her subordinates, Strange has a pretty good idea of what the Rose Queen's problem is. Still, he's keeping his mouth shut as he listens to Yuya explain the spell.

"That does make sense," he admits, with a nod. "Obviously since the threshold's been broken it would be hard to rebuild it, but the iron and barrier spell should provide a temporary solution. It would probably be best if people who visit the Sanctuary often help cast the spell: familiarity and the concept of ownership are important in these matters. Just...make certain the changelings staying in the Sanctuary know about the iron."

It should be obvious, but it bears repeating: they're part fae as well. Flowers, though... "Is it just flowers that have been causing the problems? Not anything else?"