When attacking with Leona at a fortified position, do you see which defending unit gets the Shield Two buff before choosing Leona's stun target?

Ruling: No, you do not see which unit will be fortified before choosing which unit to stun.

Sequence:

• Attack triggers are placed on the chain first
• The defending trigger (fortified position's Shield Two buff) resolves after the attack trigger (Leona's stun) is declared