Flavor Text, is used exactly for what it says - flavor. It is not rules text.
D&D is at its core a game of imagination. The flavor for the powers is there to help in stimulating that imaginative play. It is not meant to restrict it. Except of course in the most cynical and extreme of views.
This is a game, not a legal dissertation. Flavor is meant to be malleable to whatever the player, and DM want to accomplish.
If the purpose of flavor text was to restrict the player to ONLY the action described by the text then the game would be rather bland. Playing that way would be as boring, to me, as playing with constant "gamespeak."
And yet by saying "Flavor doesn't matter" you are reducing the game to exactly this. All what is left now is "gamespeak" that you can do X damage each round with the keyword "psychic".
And then you get exactly this kind of problems that the "gamespeak" allows you to do something which, according to the flavor of the current situation, doesn't make sense and it also makes it harder to use the power creatively as the gamespeak, the only thing you have for this power, only covers combat but no other situations.