by stawrulesteam » Tue Mar 13, 2018 4:46 pm
Anything in the ""prerequisite"" part of the text,
From page 20 of the rulebook on Costs & Conditions: ""The timing, costs, and conditions all must be met before an effect can be activated and resolved." but more specifically, as much of the costs & conditions MUST be met before this card can be used.
From page 19 of the rulebook: ""However, if a special ability requires a player to disable all remaining Shields, then the player is
permitted to use that ability even if they have no Shield Tokens remaining."
All power to weapons says: "and disable this ship's shields". Similar to cloak you would need at least one shield to disable to make this work; if this had the wording "and disable all of this ship's REMAINING shields" then you could have zero active shields and still make this effect go off.