User blog comment:Kir the Wizard/Reverb and Kille Frost Return?/@comment-26266279-20160518114256

And the winner is http://arrow.wikia.com/wiki/User:*TheMagicalWizard* for guessing correctly about Cisco and Caitlin masquerading as Reverb and Killer Frost.

Well it was for distraction not intel gathering though but meh minor details.