It has been a long running joke on Dr Who that his screwdriver has no effect on Wood..

![enter image description here](https://i.stack.imgur.com/lDtXy.jpg)

However, in the episode *Robots of Sherwood* the Dr uses his screwdriver on a wooden/straw target with this result...

![enter image description here](https://i.stack.imgur.com/jewPk.jpg)

Earlier shots reveal there is nothing behind the targets except empty space, and the targets are themselves are distinctly identified as being constructed of wood (notice the grain)...

![enter image description here](https://i.stack.imgur.com/19uX9.jpg)

Is this a goof?
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