Does Not So Fast counter Falling Star?

Ruling: Not So Fast cannot counter the Falling Star spell itself, but it can counter one of the two reflexive triggers that deal 3 damage, since those triggers target.

Nuances:

• The Falling Star spell itself does not target, so it cannot be countered by Not So Fast
• Falling Star creates two reflexive triggers that each deal 3 damage and do target
• Not So Fast can counter one of these two reflexive triggers, but not both