In this video you can see they are all lined up, when the message starts.

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Then Louis and Liam start to be idiots and Harry for one second turns his head to the right because he’s distracted by something.

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You think he doesn’t noticed Lou’s missing, since he was ignoring him. But look at Harry right after he turns his head to the camera.

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*panicking*
*panicking*
*where’s the spouse*
*oh here he is* 
*we’re safe*
*back to the camera*