The very fact that the statement appears in the section dedicated to the Shoot action defines that Defensive Shots only apply against Shoot actions, and nothing else. Each segment of combat actions have specific rules and order of operations that apply to them; there is a great amount of overlap, but that further reinforces that something that only appears on one section does not apply to the others. Moreover, note that for Fight and Shoot actions, the defensive combat actions have specific names (Defensive Strike and Defensive Shot, respectively), and are resolved differently. Finally, the steps of the Spellcast action list no Defensive action, other than Counterspell.
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