However you want to imagine it happening in this particular case.
To quote your earlier post, "NoNoNoNONO!"
The orcs' action has taken place because of the actions of the fighter; because of their use of deception and/or psychological manipulation.
NPC fighters can have CaGI; as such, many skilled and experienced fighting creatures could have it.
The players don't whinge about getting forced-moved by an enemy magician's "Vision of Avarice"-type power or the undead's "cause fear" power - why should they complain about the skilled combatants' "fake out" powers?