Spoilers, probably. I wouldn't know because well, I don't want to know more. But this video is supposedly leaked footage from Game of Thrones season 5 (can't wait!) and it shows six people being led to their death by fire. Like, seriously. Hell on Earth doesn't even begin to describe how hot this fire burns.
Those who have read the books came probably figure out where this is coming from (or where it's supposed to come from). For the rest of us, well, just prepare for some monster fire burning scenes in season 5.