The law is the law. You're in public exposing yourself. You've also run foul of public decency laws because you've pissed on private & public property causing acidic, amonia-related stain damage to masonry & a public walkway & road, not to mention the pong.
If someone walks past mid-stream, you're now exposing yourself to members of the public.
James Morgan is a nonce who should be prosecuted to the fullest extent of the law & placed on the sex offenders register for life to protect the Public from your rivers of beer derived piss.
I suppose you think this is a fair & rational response to you taking a leak in public?