Geez, Twilight! I expected better from you.
But seriously though. Why didn't Twilight Sparkle and her friends bother to take the Elements of Harmony with them during the trip to the Crystal Empire? Twilight was tasked to prevent the empire from falling into the hands of evil, which would imply that King Sombra would make his return. And I know that this quest was designed to be a test for Twilight, but she wasn't restricted to take the Elements of Harmony with her on yet ANOTHER DANGEROUS QUEST.
I could have just excluded the background scenes in Panels 4 through 7, but I thought they were important to show what was Twilight thinking of during that moment of silence. The motion lines also play a key role if through her mind's eye was zooming in on where the Elements of Harmony are held at.
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*MLP: Friendship is Magic is copyrighted to Hasbro & Lauren Faust.