The Ubistvo's ability to enter berserk mode at any time is quite dangerous as it moves very fast when pursuing the character. While in this state, its movement is very similar to Giant Chainsaw Man. It does not tend to stay that way forever though. It can sometimes enter normal state similar to the Chainsaw Majini albeit slightly faster. The Ubistvo movesets are:
Wild Chainsaw Swing
6 Bars (Ada's Campaign) Instant death (Jake's Campaign)
The Ubistvo swings its chainsaw wildly in an attempt to hit the player and also hitting any enemies who stands in its path. Strangely, in Jake's campaign, this attack puts the player in a QTE state rather than putting them into dying state. If one of the character is caught in this QTE state, the player must repeatedly tap the A button (XBOX360)/X Button (PS3) while the partner character needs to help the player. Should your partner fail to help you, the Ubistvo will outright kill you by slicing your neck.
The Ubistvo's wild swing path is quite linear and can be simply avoided by diving to either sides. It is advised to take caution when trying to slide past it as it can sometimes still hit you.
When the player is lying on his/her back or put into dying status, the Ubistvo will drive its chainsaw through the player's torso, slicing them in progress.
This attack only occurs when you are lying on your back or put into dying status. If however you are lying on your back, you can avoid it by rolling to either sides.
Like the Chainsaw Majini and Chainsaw Man, the Ubistvo will swing its chainsaw in an attempt to slice the player's neck.
This attack is quite predictable and the player can just simply move away or dive to an appropriate direction.
180 Chainsaw Swing
If the player is behind the Ubistvo, it will turn around wile swinging its chainsaw, trying to cut the player's head.
The player can simply avoid standing behind it or by diving to an appropriate direction.
The Ubistvo will leap towards the player while trying to strike the player with its chainsaw.
This attack can be avoided by moving or sliding away from its leap direction.
Double Chainsaw Swing
The Ubistvo will swing its chainsaw twice in succession in an attempt to hit the player.
The player can just dive to an appropriate direction when it tries to do this, or simply move away from it.
In Jake's campaign, he faces the Ubistvo twice. When facing him for the first time, try to keep you distance from the Ubistvo as it can quickly close the distance between him and you. The player also should be careful when moving around the area when fighting the Ubistvo as the area has objects that can block the player's movement. It is recommended for the player to equip a high damaging weapon such as the Elephant Killer. However if the player is in need of ammo with the Elephant Killer, resort to either the Shotgun or the Bear Commander. When using the Shotgun, carefully keep your distance away from the Ubistvo as you attempt to unload on it. If it is stunned, get close to it to perform the melee prompt and quickly get away from it while continuing to open fire on it. After an enough amount of bullets are unloaded on the Ubistvo, it will be stunned prompting the player to perform a teamwork melee with Sherry which ends the fight.
In a second fight with the Ubistvo, the J'avo will be quite a distraction to the player. However, Ada wil provide help with her sniper from a concealed location. Focus fire on the Ubistvo while also being on watch for J'avos that can sneak up behind the player. Once it is downed, the player finally will face the Ubistvo on the boat. Be wary that the boat is quite small making it slightly difficult for the player to move. Simply unload on him until a cutscene triggers.
While playing as Ada, the battle with Ubistvo will commence after attempting to open the door with a key. Keep in mind, the fight with the Ubistvo is quite tricky since Ada doesn't have a partner (unless someone is playing as Agent in co-op) and also zombies can be a distraction if the player is not careful. If the player is very accurate with the Bowgun with the pipe bomb arrows equipped, it is recommended that the player should keep a distance when firing it. If not, resort to the Assault Shotgun and simply unload on it while cautiously moving around the area. While on the bus, it is quite hard to avoid it's attacks, though the player is given an advantage with Ada's Grappel Gun. You finally face the Ubistvo on a train track. Take note that the area is quite narrow. After fighting it, a series of QTEs should commence.
The Ubistvo's legs, strangely, had became the creature's weak point, as dealing great amount of damage to its legs will cause the creature to kneel, leaving it vulnerable to physical attacks. However, in order to incapacitate the Ubistvo, the player will require great aiming since the creature is constantly moving around. Since the vital organs are carried in the chainsaw, aiming for it will injure it and quite possibly stun it.