When Margaret and Tate entered through the gates, they saw Stella on the far left in a squatting position as she tried to get the best angle to take a picture of the bed of orange flowers swarming with ladybugs. The teenager zoomed in on one of the insects, muttering, “Don’t move. Don’t move. Just one second, and…” 

In the microsecond before she tapped on the button, the ladybird she set her sights on flew away, and the teenager groaned before falling on her bum and sulking while she silently cursed the uncooperative insect. That was the moment when the same ladybird landed on her knee. Stella tried not to...