The Mosh Pit is the San Romero Junkyard, where the first boss battle with Zed takes place. After leaving San Romero High School, the sky of the Junkyard is completely black. There are several motor vehicles that surround the area, some that are aligned to form a trail that leads to Zed's pit. There are a few spotlights that are nearer the sides of the Junkyard, and a few construction cranes and steel gates that act as obstacles to Juliet's arrival.
Near to the stage of The Mosh Pit it can clearly seen a group of zombified teenagers are rocking to Zed's music. There is a large screen in the stage, that records all motion that occurs during the boss fight that also has an echoing, differentiating camera angle effect put into it. There are several show lights around the stage, with two that are constantly following Juliet and Zed, and indistinguishable wires that are scattered around the area.
The area of the first phase is mostly dark, as the spotlights are the only light sources. The spotlights that hang over Juliet and Zed are a generic yellow-white color, while those that surround them emit red, purple, blue and pink.
In phase two the area becomes darker, and the spotlights are then limited to red, purple and yellow-white.
When Zed blasts profanity at the player, the screen begins to be covered with screen tone, purple lightning retracts towards him, as well as clouds. As the words form purple static sparks and linear shadows appear, the event will also slow down the game, giving the player the chance to react to the attack.
A similar appearance is displayed during Phase 3 when Zed floats, and throws his mohawk discs. The screen begins to get covered in screen tone, several spotlights focus on Zed, red zaps begin to retract on him, and a gust of wind appears to be circling around him.
The first phase starts with Zed attempting to attack Juliet at the beggining. When Juliet sees that Zed is harming animals she throws her lollipop in the air and the battle begins. Zed will use generic melee moves such as small stabs from his microphone. He has high speed and can use this to either get away from Juliet or to surprise her. He will also scream profanity into his microphone, transforming them into blocky letters that will fly towards Juliet . When weakened Juliet will cut him in half mid-way.
The second phase will start after he is sliced in half, only to reveal that it has no effect. He will then scream, summoning a barge of speakers. Zed will jump on these speakers and will throw disks that will bring damage to Juliet. Juliet will have to break near to all of the speakers and then have Zed summon an even larger Speaker to come. Juliet will have to saw this one slowly but Zed will try to prevent her from going on.
The third phase will start after Zed is sliced a second time through the side of the abdomen. the third phase is similar to phase one with the exception of him summoning his mohawk disks and able to repell Juliet away from him. When his health is low, he will then scream into his microphone screaming "YEAH". The words will then create a wall of words that protect him. Juliet defeats him by slicing him in half a second time.