The Wall of Flesh's sweep direction is determined by its spawn location. Spawning it on either side of the world will cause it to sweep in the opposite direction (regardless of the direction the Doll was thrown). Maximum fight space can be achieved by spawning it at the extreme right or left of the world, though these areas have fewer natural structures and may require additional lava survival gear or construction. Be aware of the fact that The Wall of Flesh might not fight but just leave the battle if you spawn it too close to the edge.
When Repliforce's plan was finally put into motion, Zero rushed to the Space Port to stop the ascension of Repliforce to the newly constructed space station, Final Weapon. There Zero battled Colonel, this time not holding anything back, and regrettably destroyed him in the process. After that, he traveled to the Final Weapon where he was, much to his surprise and horror, confronted by Iris. Holding Colonel's control chip, she was now blinded by her grief for her brother and anger that Zero killed him. She then fused with Colonel's chip, resulting in the creation of a large Ride Armor-like combat form which attacked Zero. Even though he didn't mean to, Zero damaged the exterior power core of the structure, resulting in the destruction of the armor and Iris within. He hurried to Iris' body, but it was too late to save her. Whispering to Zero that she wished to live with Zero in a world of only Reploids, she died in his arms. Zero, who was totally overthrown by the pain, began questioning his own reasons for fighting and the means of his own existence. 153554b96e