Can Ezreal's Legend ability be used in response to targeting the same enemy unit twice, before those spells resolve?

Ruling: Yes, Ezreal's Legend ability can be used immediately after choosing/targeting the same enemy unit twice, without waiting for those spells to resolve.

Nuances:

• "Choose" is equivalent to "Target" for the purposes of this ability
• The targeting action itself triggers the ability condition, not the resolution of the spells doing the targeting