The weapon consists of pressing the shoot button to slowly form a shield of 8 bubbles rotating around the player, and pressing the shoot button again to make them spiral outwards from the player.
If the player's bubbles collide with a vulnerable enemy, they deal damage and will disappear upon collision.
If a bubble is hit once with an enemy projectile, it will change visually to indicate it has taken damage. if the same bubble is hit a second time with an enemy projectile, it will pop and disappear.
- If a player has a Water Shield barrier around them and falls into burning Oil, the determining factor on what behavior takes priority is the player's falling speed. This has confirmed to be a glitch by staff member Luigi.
- If the player is at the start of their fall and at a slow falling speed, the Water Shield barrier will put out the flames and the player will be safe.
- If the player has been falling for a while and reached a fast falling speed, the player will die to the burning Oil, immediately followed by the Oil's flames going out.