Movement speed is randomized within ± 10% range and further modified by a multiplier based on difficulty. Once enraged, Gorefiends will never stop sprinting until they are killed.
Gorefiends will sprint once they are shot. They do not sprint on sight despite having 100% sprint chance. Gorefiends will only begin sprinting upon getting close (8m) to players.
Gorefiends move slowly when docile, and sprint when enraged. Damaging with on-perk weapons and then finishing it off with an off-perk weapon divides the XP and grants it to both perks.Killing with weapons other than your current perk grants the XP to the perk that weapons belongs to.