If a unit targeted by Falling Star, Singularity, or Hidden Blade is moved by cards like Flash or Flight or Fight, will those spells still affect the units?

Ruling: It depends on the card's target requirements. Falling Star and Singularity target "a unit" or "two units" and will resolve fully as long as the target is still on the board. Hidden Blade targets "a unit at a battlefield" and will resolve with no effect if the unit is no longer at a battlefield.

Nuances:

• For Singularity, if one target unit is no longer valid, the other target still receives the damage (do as much as you can)
• For Falling Star, the spell creates 2 reflexive triggers, each with its independent target unit