"Cole Phelps and Jack Kelso: with some people, it's as simple as chemistry. Two guys who should have been friends, but their personalities got in the way. Phelps - a good guy, wound way too tight. And Kelso - a quiet man who could never walk away from a fight."
Cole Phelps and Ralph Dunn are patrolling in their police vehicle until Dunn notices Wendell Bowers, who jumped his parole after being arrested by Dunn. Cole comes out of the car and chases Wendell down, resulting a fistfight.
When Ralph Dunn turns on the siren, Wendell will start to run. Phelps will get out of the car and pursue. Wendell will go down into an alley as he tries to escape. When Dunn blocks the alley with the squad car, Bowers will climb up a nearby fire escape and the chase continues on the rooftops. After a lengthy chase, Phelps finally catches up, but Wendell is waiting to attack. A fistfight triggers after the cutscene. Phelps should be able to defeat Wendell whereafter he'll be taken to jail. However, if you fight close enough to the roof edge, Wendell might fall off the building whereafter, he'll be taken to the hospital, and then to jail.