General objectives of the stage: Pigeon coop is a short stage within Run For Your Life mission. It is filled with action, because you'll have to avoid enemy helicopter and hostile policemen.
After regaining control over Hitman, walk to the edge and drop down landing on the lower roof. Note that a police helicopter set off towards you. So quickly head to the nearest building, (screen above) because after a while enemies will start shooting at you.
During walking through the building attacked by a helicopter it is worth to crouch and not rush too much, "allowing" the machine to clear a path for Hitman. Follow a very linear path until you reach a place where Agent 47 will perform an impressive jump towards the adjacent building. This is the end of this scene, but the enemy flying machine won't completely give up and you have to avoid it until you get to the next stage.
The next goal is to reach the door leading to the adjacent residential building but, if course, you'll encounter several policemen on your way. Regardless of the difficulty level, a single officer should rush towards you. If you want, you can of course stun or kill him, but it is best to do it without alarming anyone.
Getting rid of above mentioned opponent is not mandatory. You can also sneak past him or use the left ventilation shift entrance, shown on the above screen.
Eventually you should reach to the main part of the rooftop. On lower difficulty levels you will encounter here two policemen and on higher setting, there are three of them. In addition you must avoid entering areas illuminated by helicopter spotlight, so it is extremely important to hide behind covers.
Carefully move to the left, automatically jumping between adjacent covers. Remember also about avoiding helicopter.
After reaching the cover located closest to the entrance to the residential building, wait until officers end their conversion. You can now wait until they walk away or leave the cover and use Instinct to hide your identity (you must wear Chicago policeman disguise). Regardless of the chosen behavior variant, you have to walk through the previously mentioned door.