Surprise Strike (Ex): You can expend one use of mythic power to make a melee or ranged attack at a target within 30 feet as a swift action (in addition to any other attacks you might make this round). When you make a surprise strike, the target is considered flat-footed regardless of any class features or abilities it might have, and you add your trickster tier as an insight bonus on the attack roll. Damage from this attack bypasses damage reduction.
There is a Trickster path ability that is similar that only calls out causing non-mythic foes to be auto flatfooted with respect to abilities that prevent being flat footed (flatfooting?) Should Surprise strike have a similar language, or do you need Mythic Uncanny Dodge to counter it?