Quoted from the Wiki:

A2: Per the following circumstances, the Soulwind state caused by Starfrost Swirl will grant characters the Detector effect, increasing their Physical DMG by 10% when they are on the field. (1 stack, 10%)

A4: When an active character affected by both Skyfeather Song's Eagleplume and Starfrost Swirl's Soulwind at once scores a CRIT Hit with their attacks, Soulwind will grant them 1 stack of Detector from Suppressive Barrage. (1 stack, 10%)

C0 total 20%

C2: When Starfrost Swirl's Flowfrost Arrow first hits an opponent, or its Rimestar Flare hits an opponent, 1 Detector stack from Passive Talent "Suppressive Barrage" will be generated. (1 stack, 30%)

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