Tiffany struggled to her feet and did the only that made sense to her at that moment...she ran. She sprinted out the room and - in some confusion - up the stairs. Her only thought was to get away from Katie as quickly as possible. Her former friend had transformed into this...gross slob before her eyes! As far as she knew, it may be contagious.
Katie cried after her "Hey? Tiffany? Wha' th' fuck's th' matter witcho?". She waddled to the base of the stairs, and for a moment almost decided to go home instead of follow her. After all, if Tiff wanted to spaz and get her boney ass lost in this abandoned house, then that was her fault. But...
Tiffany was her friend. She'd been her friend since 2nd grade...and she couldn't leave her. Tiffany was having some kind of...psychotic episode or something. Katie had to help her.
So, after some struggle...Katie started up the stairs. They creaked and groaned under her ponderous weight, and she was a little scared that they'd collapse. Eventually though, she made it to the second floor, and called out "Tiff? Are you up here? Hey, Tiff? Come on, girlfriend. Don' be like this. Somethin's wrong, hun. Let me help you."