Heron problems

Question:

I recently had a great blue heron attack my pond. Before I could get the net on, he got my koi and put a hole in the bottom of the liner. The rocks around my pond are cemented, so I don’t want to have to replace the whole liner. Would I be able to cut a piece of liner to fit the bottom and cover with pebbles? If not, do you have any other suggestions? Thank you, Cheri