Kelsi frowned in concentration.
"Mobiliarbus!" it didn't move. She swished her wand.
"Mobiliarbus!" it floated up. And moved to the right on it's own accord. And fell over. Robin purposely stepped on it.
"DARN IT, ROBIN!"
"=3= My bad."
Kelsi kicked Robin's chair angrilly, and it moved a tiny bit. She aimed another kick at Robin's knee. Robin crossed her legs, making it not possible for Kelsi to kick her sister's legs.