You have to shoot the middle box with a question mark on it. A dart gun falls down and you can use that to shoot the balloons without touching the turret. Once you have done that the blue mushroom is activated which you can use to teleport. Avoid touching the green mushroom or it will trigger another turret.
Shoot under his trident when he lifts it and then move to avoid lightening.
You have to shoot the middle box with a question mark on it. A dart gun falls down and you can use that to shoot the balloons without touching the turret. Once you have done that the blue mushroom is activated which you can use to teleport. Avoid touching the green mushroom or it will trigger another turret.