The Mono-Sphere is a turret that generates a corrosive "bubble" around a bloon that can quickly eat through it, however other monkeys/turrets are set to not attack anything with a bubble by default because most things will pop this bubble (however they can be for whatever reason set to attack bubbled targets). If the bloon within unleashes the attack the attack will be weakened to it may even stop it, although things can breach the bubble and weaken/destroy it, the bubble can stop passive effects also, but some may not be affected. Anything in a bubble is slowed by 25%