Sea Stacks Splendour

No signal on Orkney yesterday so I have just backblipped.

The main shot is of Yesnaby Castle, a 35m high sandstone sea stack with extra arch at the base. It is often used for practice by those climbing the Old Man Of Hoy (137m).

The extra is of a stack close by that seems to be using its arm to lean on the cliff. When the arm goes will the stack fall?