Can you reveal Hidden Teemo after using Falling Star to save a battlefield, and when can you choose Teemo as a target?

Ruling: You cannot choose Hidden Teemo as a target when Falling Star's reflexive triggers are created. However, if your opponent reveals Hidden Teemo as a reaction before Falling Star resolves, then Teemo can be chosen as a target for the reflexive triggers.

Sequence: Scenario 1 (Teemo revealed before Falling Star resolves):

• You play Falling Star
• Opponent reacts with Hidden Teemo
• Teemo resolves immediately
• Falling Star resolves, putting 2 reflexive triggers on the stack
• You can choose Teemo at this point for the 2 triggers

Scenario 2 (Teemo revealed after Falling Star resolves):

• You play Falling Star
• Opponent passes without reacting
• Falling Star resolves, putting 2 reflexive triggers on the stack
• You choose non-hidden units on board (cannot choose Hidden Teemo) for both triggers
• Opponent reacts with Hidden Teemo
• Teemo resolves immediately
• Reflexive triggers resolve one by one dealing damage to whatever was chosen earlier

Nuances:

• Hidden Teemo cannot be targeted by the reflexive triggers if still hidden when targets are chosen
• The timing of when Teemo is revealed determines whether he can be targeted