Chainsaw

The Chainsaw is Jack's signature weapon, and the one he uses the most during his participation in DeathWatch.

Description
The Chainsaw is a retractable blade that is embedded in Jack's cybernetic right arm. It can be extended and retracted instantly at any time, provided it is not overheating.

Interestingly, the Chainsaw's blade is longer than Jack's forearm.

Temperature
As implied, the Chainsaw will generate heat when it is used, which is indicated by the lower bar of Jack's HUD. With a full bar, the Chainsaw can be used up to a total of about 13 seconds before it needs to cool down again. The cooling process starts immediately once the Chainsaw is deactivated, and takes twice as long, about 26 seconds at maximum. Additionally, should the Chainsaw overheat, there is a penalty of 3 seconds before the cooling process begins. This is indicated by puffs of smoke emitted by the chainsaw and a remark by Kreese and Howard.

Involvement in the Jefferson Island DeathWatch games
As the weapon of choice as well as being attached to Jack's arm, the Chainsaw can be used in any level at any time, making it the most accessible of all weapons. Plus, it will not break, no matter how often Jack uses it, and simply needs to cool down regularly. Jack will also often use the Chainsaw during finishers and Power Struggles. Should Jack get trapped by a Tire or a Garbage can, he will use the chainsaw to break free. Both actions do not affect the cooling status of the Chainsaw.

Despite being a signature weapon of Jack, the Chainsaw is not unique; Kojack uses a Chainsaw as well, and it too is mounted on his right arm.

Some enemies use a chainsaw as well, like some of the Thugs or Soldiers, but they are a different type of chainsaw. Big Bull Crocker uses a Double Chainsaw.

Attacks
There are four different attacks that Jack can perform with the Chainsaw. All of them are set up by holding the B button. Then the attack can be executed by swinging the Wiimote either horizontally or vertically, either on the ground or in midair.

Most Grunt Enemies are killed by a single attack of the Chainsaw, which yields no points (if one does not count the base 10,000 points for the kill itself). However, some tougher enemies as well as subbosses can withstand more than one hit with the Chainsaw. Attacking a subboss with the Chainsaw yields 1,000 points, whereas an attack against a Grunt Enemy yields 5,000 points (provided they survive).

Finishers
There are eight of Jack's finishers where he makes use of his Chainsaw. They are mostly randomly selected out of Jack's B Finishers, but some require the enemy to either be standing, downed or in midair. Each Finisher with the Chainsaw is worth 10,000 points (plus the base 10,000 points for the kill itself). The only exception is the last finisher, as it does not kill the enemy. Instead, only the points for severing the legs are awarded. (500 points for each leg, 3,750 points for each leg of an Asian Town grunt.)
 * Jack will plunge the Chainsaw through the enemy's chest. He then will rip his heart out and squash it.
 * Jack will plunge the Chainsaw through the enemy's back while grabbing his head with the other hand. Jack will then slice upwards while at the same time ripping of the enemy's head and spine.
 * Jack will vertically slice a standing enemy.
 * Jack will horizontally slice a standing enemy.
 * Jack will stand below an airborne enemy and perform an uppercut with the extended chainsaw, slicing through the enemy's midsection.
 * Jack will step onto the back of a downed enemy and jam the chainsaw through his neck.
 * Jack will kneel onto a downed enemy, holding him down with his left hand, before he vertically slices through the enemy's upper body and head.
 * Jack will horizontally slice both legs of the enemy at once. This is not really a finisher, as it does not kill the enemy. But it can be used as a setup for a curb stomp.

Trivia

 * The Chainsaw will generate a noise from the Wiimote with every swing.
 * Jack's usage of the Chainsaw bears a striking resemblance to Ash Williams' from the Evil Dead series.