From page 73 of Campaign Ops (pdf):
The Antagonizer must then make a special “psychological” attack on the target in place of a normal weapon attack, in the form of a Piloting Skill Roll with a +4 target modifier.
Toward the end of the entry the following is stated:
Attempting to once again antagonize a unit that has already been enraged in the current scenario results in a +4 target modifier to the Antagonizer’s Piloting Skill Roll, reflecting the opposing warrior’s realization that they are being toyed with.
The way the surrounding text reads it sounds like trying to antagonize a unit that has already been antagonized should be harder, however a target modifier of piloting skill +4 is mentioned in both places. Should the first modifier be something lower than a +4 or should the second modifier be something higher?