Magpie took bantam chick

[Partridge]

A magpie swooped and took one of our silkie bantam chicks (5 weeks) from its brooding box yesterday.

I was a couple of metres away and we live in the city centre with a walled urban garden. Will these chicks still be vulnerable to magpies when they are fully grown (bantam size). I had planned to have them free ranging in the day while I am in the house but am now questioning this .

[MyICDiscalledsparky]

We have bantam sized silkies. They would see a magpie off pretty quickly.