The following season – year one of The Flash and three of Arrow – The CW featured its very first DC Comics crossover, spanning an episode of each series.
Over the past few years, The CW has built up its shared television universe focused on DC Comics superheroes to include Arrow, The Flash, Legends of Tomorrow, and CBS transplant Supergirl.
Now, Arrow is gearing up for an extremely quick crossover in next week’s episode featuring The Flash.
As such, it’s likely this photo is taken from a previous episode of The Flash, used as an example by Guggenheim of how quickly The Flash will be in and out of the Arrow episode.