They probably pounced on him with a heavy handed attitude, frightened the shit out of him with threats if possible prosecution & subsequent criminal record, & the future ramifications of that, & then "nicely" pointed out that there is a much easier alternative ?
Don't get me wrong, I'm 100% pro police, but there will always be some that overstep their remit & powers, such as the west Yorkshire cop filmed recently saying he'll "make something up", or another force that today admitted fining someone during lockdown as "he couldn't possibly be excercising as he's wearing jeans" lol.
Apparently you've got to dress up like Usain bolt to exercise ?