Eric Galipeau, a club-mate of mine, playing in the indoor world championship at Potters lost a singles match because he failed to “cover’ his opponent’s bowls in the final end of a set. This is the most dramatic example of this situation that I have ever seen and the shot that beat him was extraordinarily good!
It is a textbook example of the need to cover opposing bowls at the end of game you are winning. The relevant end starts at 1:29:14 in the video against Z. Hadar which can be found by searching:
https://www.youtube.com/watch?v=h09UQar6HRE&t=4978s