TV Episode | TV-PG | | Action, Adventure, Drama
Zoom unleashes an army of Earth-2 meta-humans, the leader of which is Black Canary's doppelganger, Black Siren; Joe worries when Wally goes out to help The Flash.
When Iris states that even "in blackest night" there still remains hope is a nod to the Green Lantern mantra: "In brightest day, in blackest night, no evil shall escape my sight. Let those who worship evil's might, beware my power - Green Lantern's ... ...
She's out like a light, huh?
Barry Allen: Yeah. Jay really did a number on her.
Cisco Ramon: It's not like he exactly used kid gloves on the rest of us.
After Black Canary unleashed a sonic scream to incapacitate The Flash, the scene switches from an on-the-streets view of the confrontation back to STAR Labs, where on the computer screen data about her attack is recorded. At the top of the screen, "250 DB" reads, indicating that the loudness of her scream was 250 decibels; however, the loudest theoretical sound that could be observed or recorded is 194 decibels. For practical measurements, past around 170 the scale for loudness falls apart; measurements this high only reflect energy, not loudness as the vibrations become more of a shock wave rather than an observable sound. At 250 decibels, the amount of energy for this sound is approximately equivalent to the explosive power of the atomic bomb dropped on Hiroshima.
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