*The flame grabs him around the armpits and lifts, and Gideon is suddenly in a position to observe that he's on fire. But the pain and the stink of it is immaterial because it's yanking him up, up, and he'll be a sitting duck up there--he can see the woman raising her wand to deliver the Killing Curse--but he knows the curse--Hexcorrigiatus or something stupid like that--and the counter-curse, what is it--*

Arenaceous!

*--and the rope is dissolving into sand and it isn't burning him anymore but it's also released him and the back of his pyjamas have just been brushing the ceiling. He crumples to the floor and his legs bend badly and he is quite sure he feels something in his shin or both of his shins break, but his wand is still clenched tightly in his fist and the next curse he sends doesn't miss.*