I can only see Steven and Amethyst fighting if:

A. They're testing Steven's strength starting with the least combat experience (Since Amethyst was born last)

B. Steven and Amethyst get into a fight on who gets the last pizza (Or any other assorted food) in the fridge.

C. Amethyst defects from the Crystal Gems and Steven has to fight her to bring her back on their side (Which makes the most sense seeing as the episodes around this episode revolve around Amethyst in some way, like Crack the Whip and Gem Hunt)

Either way, I can't contain my emotions that Amethyst and Steven are gonna fight! >o<

i approve this interpretation. Seriously guys, they have fun non drama related episodes too.