No witnesses would have been better. He's perfectly capable of checking again every few hours until there's only one fairy visible.
But he does have atium. He's more than fast enough to reach both fairies within his seconds of precognition. He sees ghostly shadows of them running from him, but they don't appear to be yelling or otherwise raising an alarm. So he charges.

He easily grabs at where they're going to be. Hand over the mouth of the smaller one; if it wants to bite him that's fine. Jump to the roof and do the same to the second. It's almost too easy.