the whole park is leash on EXCEPT one part of the park, empty grass land where it is an OFF-LEASH area.

park so big, but choose the off-leash area to play badminton.

I've read before somewhere it is a gazette area for this purpose.

the time being 745am, I'm sure not many dogs around too. the woman must be first time there, thought the guy shouldn't be there in the first place.

if she were there in the evening, she probably wouldn't have played badminton in the sea of dogs.