Whenever you go near a pufferfish with a shield and stay on it, instead of blocking damage for a second and bouncing the pufferfish back with a cooldown to the shield to block damage again (Having to wait a second or two), the pufferfish just destroys the durability on the shield, while the shield with no cooldown keeps blocking the damage.
Through testing this way, a Pufferfish can destroy an Unenchanted Shield in three seconds and an Unbreaking III Shield in about 12-15 seconds.
Three Videos to show this in action:
Steps to Reproduce:
- Get a Pufferfish in a bucket and put it in a 1 X 1 Hole.
- Raise your shield by crouching and approach the Pufferfish and stay over it with the shield while crouched.
Pufferfish stays in the 1 X 1 Hole shredding through shields in seconds, with no cooldown time to the shield blocking.
The Player's shield should block the first instance of damage from the Pufferfish and push it out of the 1 X 1 Water hole to bounce around on the land, putting the player at risk of Poison damage while the couple of second cooldown occurs on the shield before a player can block again with it.