A friend of mine did almost this same exact thing- except he wasn't drunk.
A former aquaintance of mine wasa cop. He was driving down the street when a guy looked at him and headed off running. This is probable cause to pursue and detain him, so he followed down the street in his cruiser and gave chase on foot. The dude jumped off a 4 foot high wall to find it was a 20 foot wall on the other side. Broke his leg. He had no warrants and was not being looked for. Turns out he was afraid he would get arrested for being drunk and ran as soon as he saw a cop...