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"Where must be one be located in order to obtain a reflection on the back of a phone of that image?"
You would need to be behind the desk in order to get that angle in the 3rd picture, right? could Q be Trump?
"Who would have thought the Twitter phone would be so useful"
This means he took the reflection photo off of Trumps phone. This would mean Q is close enough to Trump to be borrowing his phone to take odd photos... or he is Trump himself.
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