Walkthrough

Boss: Missionary (Apartment Rooftop)

Equip the Shotgun for this battle. You may also want to consider the Bulletproof Vest if taking damage is a concern of yours, but it's probably best to go without it due to the mobility restriction and how key movement is in this fight.

If you fire at the Missionary from the front, you'll witness and hear the creature block your bullets with its blade hands, plus it'll almost always hit you back. Therefore you'll need to find a way to shoot it from the side or behind to hit all meat. To start off, you can essentially run right up to and past it for a free shot from behind while it may swing and miss where you were. You'll get a free Shotgun blast or kick while it's down, but stand clear while it gets up or prepare to block to prevent almost all damage as it wildly swings its arms (or equip the vest to prevent any damage with a block, but the difference is negligible).

Throughout the battle the Missionary will try to space itself from you by running very quickly away and around the rooftop and then coming back at you for attacks. When this happens, try to turn the tables back and get behind it by running towards it but at an angle so that you avoid any head on attack as it comes towards you. Also consider strafing to do this or avoid an incoming attack as it may rush you, then always try to blast it from behind or the side once it passes. You can often still get a shot in as it begins to run away, as long as its back or side faces you.

Sometimes you'll be able to get in a free shot or kick while it's down but often it'll only remain down for a short period. So consider taking a shot from farther back or be prepared to block after your attack if close enough. Often after you successfully block, or if you're out of swing range, you'll immediately get another opportunity to shoot with its back facing you, so take it if so. Otherwise, it may turn to face you and swing, but this is really simple to avoid by running or strafing away, further leaving its back or side completely exposed for another easy blast.

Rinse and repeat, avoiding and running past its attacks while it runs around until it exposes its back, and taking advantage while its back is exposed after standing (or standing then attacking).

Missionary's attacks:
This creature has several attacks, including a thrust, standard swing and running swing. Additionally it may flail both blade arms while standing up after being downed and can also counter attack if it blocks your fire from up close. Try to always maintain a distance to the Missionary and never let it get close enough to attack you. Do this by always being on the run and only trying to shoot it after it either swings and misses you or runs past and is exposed.

If you run out of Shotgun ammo, the Handgun is fairly okay but lacks the stopping power. The Missionary normally blocks Handgun bullets from the front as well, however equipping the Silencer will hide the muzzle flash and prevent it from blocking anything. I wouldn't recommend melee weapons unless totally out of ammo. If so, use the Katana and only go for swings from behind after it misses you. Don't get greedy and leave before it gets a chance to swing back.

After knocking down the Missionary four or five times, with about 6-10 Shotgun shells on Normal and Hard, the creature will stay down. Kick it to end the fight for good.