If I cast Bellows Breath on an enemy Unsung Hero and Recruit, can I proc my Ezreal Legend?

Yes, you can satisfy the requirement for your Ezreal legend ability by casting Bellows Breath in this scenario.

The Ruling

According to RiftJudge FAQ #8816, Bellows Breath is a spell that requires you to choose (target) up to three units at the same location.

Ezreal’s legend ability requires you to have "chosen enemy units and/or gear twice this turn with spells or unit abilities." Because casting Bellows Breath—targeting two enemy units—constitutes two instances of choosing enemy units, you fulfill this requirement.

The Sequence

1. Playing the Spell: You play Bellows Breath and choose your two targets (the enemy Unsung Hero and the Recruit).
2. Targeting Finalized: As soon as the spell is finalized on the chain, those two choices are locked in, satisfying the "chosen twice" condition for your Ezreal legend (as established in RiftJudge FAQ #9631 and RiftJudge FAQ #8979).
3. Activation: Once the spell is on the chain, you have satisfied the condition. Provided you have priority in an Open State (after the chain resolves or if you have focus), you may exhaust your Ezreal legend to activate its ability and draw a card.

Note: It does not matter if the units are destroyed or if the spell is countered by an effect like Not So Fast (per RiftJudge FAQ #8979); the condition is satisfied the moment the targets are chosen and the spell is finalized on the chain.