An answer that's no answer at all. It could be that a 'Great One' was drawn to them, perhaps fleetingly. Or that this was residual power with no ominous other entity behind it.

"The things that humans rejoice over are usually cause for concern," he points out, stroking his beard thoughtfully. "Silence might not mean they're absent, but their gifts appearing might not mean they're here? I thought you were the one who knew about these things. You can't tell if they're here or not?"