Double PvP Stun Evasion: Increases the chance of inflicting Double Stun which grants doubled duration period of such effect during PvP.
Here’s how I understand the ability now:
It increases the chance of evading a PvP stun attack. Instead of inflicting a stun, it helps the character dodge one entirely.
If the evasion is successful, the attacker is hit with a "Double Stun" instead. This means the attacker is stunned for twice the normal duration.
The base chance of evading a stun and the base duration of a regular stun are still important factors. Knowing these values helps assess the overall effectiveness of the ability.