As you're being chased you have to taunt back at your pursuer, "Ha ha ha! You didn't have time to wipe! Now your undies are all shitty and you'll have to go home and change! Ha ha ha! The more you run, the worse it smears!
And hope that he doesn't have a gun.
Take a video of him chasing you.
Put the whole even on YouTube for the world to see.
Think of the views. You'll be famous.
All for peeing on some guy's shoes. You're welcome.