What is the blue bubble around paladins?

Question

It only lasts until he attacks, so it doesn't appear to be an effective shield as I would first guess. I had 8-10 paladin guardians at the time, and only 1 ever had this happen.

What is this shield/aura the paladin has around him? What does it do?

EDIT: The paladin also had this aura active between waves, so I don't think it is related to any kind of enemy. Proof: the "2" in the screenshot below is the countdown to the next wave.

Answer

In my experience, I've seen that effect when a Paladin is being hit by something it can't counterattack (ranged flying enemies). This usually ends one of a few ways:

• Something comes within melee range and the Paladin beats on it instead.
• The ranged mob dies via some other means or stops attacking the Paladin.
• The Paladin dies.

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