Unlike Phoenix, Wizard can’t be rushed. To actually kill him, you will have to get there with stealth. This is due to many spots having unlimited enemies if you alert them. While this is still hard, this guide will give you an idea of how to do it. If you’re having issues with a part, try another plan of attack.
Like the previous mission, I just ran with the recommended choice. Really nothing matters, besides having the PE4 Charge. This is because you will need the pistol (triangle), to not alert anyone.
At the start, you will see a laser trap. These will activate a poison gas, which will kill you (or enemies) instantly. You want to avoid them at all cost. Simply shoot this with the pistol and then advance. This will cause the enemies to move, which is required to sneak in.
This guy is perhaps the dumbest AI in the game. As long as you don’t run at him or walk directly in front of him, he will be completely oblivious to your existence. DO NOT KILL HIM or you will fail. Move to the stairs, but be careful.