It seems like the Hunter emp blast that disrupts agent's has some non-standard effects that I have noticed:
1: Ravenous just straight up doesn't work with the defensive or offensive primers when the player is disrupted. I have footage of it here: https://streamable.com/u3aigw: (https://streamable.com/u3aigw)
2: Even when at or above the normal disrupt immunity threshold of 95.8% the Hunter emp will successfully disrupt the player for a short duration. If a shield is out the disrupt would make the shield be retracted.
Edit: So it seems like Ravenous defensive primers don't work when the agent is disrupted. Tested with a emp grenade in the shooting range. Apparently that has been a big for awhile according to some people I have talked to.
Hunters have a different emp than usual and requires more resistance than normal to be immune.