These are extremely annoying enemies, as they teleport around the area, bring in a constant stream of reinforcements, and are well shielded. However, you will always have a Jump Pack equipped when you encounter them. Their psychic shield gives off a distinctive green glow, search for it, then jump, Ground Pound and melee combo. Focus on the Weirdboy, as any other Orks you kill will simply be replaced later on however this can be useful for hoarding kills in order to gain Achievments.