Syrlya is having much the same idea Lambert is--maybe it's just the alcohol that makes that seem like a good idea.

"Could you just... scry directly into the lake?" He waves the empty shot glass vaguely. "The whole lake?"

Think of the map coverage they could get! There's the obvious problem of 'Strange can't scry between realms', but if Syrlya's been told that he doesn't remember it right now.