Moth and sparrow

I noticed a silver y-wing moth on the inside of our window in the conservatory. I tried to catch it and in the process disturbed the moth which flew around the inside of the window. All of a sudden a sparrow appeared, hovering on the otherside of the window trying to catch the moth.

(Moth photographed from outside the window when the sparrow had gone)

I have seen sparrows successfully catch moths which they have disturbed from their resting place and once caught back the moth on the ground to subdue it and make it easier to eat.