When fighting the wind demon run in to one side of a cave and then when he starts sucking run out graba rock and throw it into his suction from the side. He will then suck in the rock setting you up for a free hit. Repeat this until you beat him it should be 3 times like all the other demons. The rabbit talisman can come in helpful if you start getting sucked in. You dont really need to use a cave to avoid the suction but I'd say thats wat they are made for.