I'm not one for story so I may have missed it but I don't recall any hints given to light it on fire in addition to that they clearly show the part you light on fire as metal. --- Crowd: Free Tibet, Free Tibet Peter: I'll take it, hey China I have something you want but it'll cost ya...That's right all the tea GT: Garudin
the idea of it was great but damn not one hint until a message popped up on the ledge --- Currently Playing : Titanfall, FFX/X2 HD, Dark Souls 2 and Elder Scrolls Online Looking Forward To: Destiny,Mario Kart 8, Smash Bros, Evolve The Order 1886
giligan tells you about the windmill when you talk to him.
Sorry, but to me, an NPC saying "the windmill pumps poison" does not equate to "use this never seen before mechanic to set fire to a metal object". Tbh it seems like its a design decision left in from when you would have actually had a reason to be carrying a torch around. --- Even a stopped clock, tells the right time, twice a day.