From an eye witness:
To clarify what I saw, Murph [Murphy is a name given to the dragon by fans - ed.] was in an upright position, ready to make his grand entrance, when the head and neck fell forward with a thunk. I immediately knew it wasn't supposed to do that.
Second shown was cancelled and he is still sitting out there shrouded by the mist shields.Power failure or major mechanical failure? Hopefully we'll know more soon.