I'm pretty sure a Slytherin would also jump onto a piece of furniture that someone is already on and shove said person into the lava. and ravenclaw; wouldnt the heat from the lava kill you just a efficiently as the lava itself?
It took me 5 days to read a book that was like 600 pages. It takes me days to read a book that's pages! I hate when people say books are "so long" and then your just like "Seriously? Have you ever read Harry Potter?