Paladin's PvP move Intervene has the following description, yet the additional effect of stun does not occur at any time. This either is bugged or that part of description was not meant to be included.

Rushes target and delivers an attack with a potency of 2,000.
Additional Effect: Stun
Duration: 2s
Additional Effect: Grants a stack of Sword Oath, up to a maximum of 3
Duration: 10s
Maximum Charges: 2
Cannot be executed while bound.

https://na.finalfantasyxiv.com/jobguide/paladin/#pvp