What does the Head Parasite do?

[Stretchytall]

What does the Head Parasite modifier in the new Havoc mode do? I didn't notice any difference in combat with the enemies that have it.

[Gustav]

they explode with a headshot i believe

[kuli]

• adds a different head model which has a green outline; this head hit zone has the Infested armor type; hitting the head with a ranged attack makes the enemy explode if the attack leaves the enemy at or with less than 30% max health, melee attacks cannot trigger the explosion; the explosion has a max radius of 6m, does not ignore toughness, deals 7.5 base damage to players (if no toughness, 50% of this amount is dealt as corruption damage), and deals average damage and decent stagger against enemies
  
• increases enemy movement speed by 25%
  
• grants immunity to suppression
  
• increases enemy hit mass by 50% which makes enemies harder to cleave

Further details: https://steamcommunity.com/sharedfiles/filedetails/?id=3318538305

[Caruwr Eirin Gwlanus]

Distract attentive players by making otherwise menacing enemies look HILARIOUS
https://steamcommunity.com/sharedfiles/filedetails/?id=3407584074

XD

[Blackout Blake]

It can be either a blessing or a curse. These head parasites can be found on meatchunk elites and specalists, which can make dispatching them far easier with a powerful ranged weapon; However, you run into the risk of hurting yourself and your allies if they're too close.

...Looking at you, assail psykers.