Vashkoda writes...

Iron is obviously harmful to the fey--even deadly. However I don't understand why it is that once Puck and the Sisters were wrapped in iron chains, they followed the orders of whoever captured them. It's not like they weren't able to use magic to free themselves, as Puck was obviously able to cast spells for Demona. I don't see why they couldn't do something simple like turning themselves into mortals or teleporting away and leaving the chains behind. Similarly, I don't see why Oberon couldn't use his powers to escape from the bell (unless the bell shorted out his magic completely, but then I don't understand why this is more harmful than being in direct contact with iron chains).

Any clarification would be appreciated!