Your roommate is describing a dream they had last night. According to your roommate, in the dream they were being chased by a giant snake that they couldn't see. But as they were being chased, they realized that this was just a dream and it wasn't real. And they realized that they could escape from the giant snake by flying away, so they imagined they were holding a giant helium balloon that took them up into the sky away from the snake. What is your roommate describing?

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