Can I fight or flight out of Vilemaw's Lair?

No, you cannot use Fight or Flight to move a unit out of Vilemaw's Lair to your base.

While you can legally activate the card targeting a unit in Vilemaw's Lair, the movement effect will fail to resolve. This is because Vilemaw's Lair explicitly states, "Units can't move from here to base," and in Riftbound, a "can't" restriction always overrides a "can" effect.

Key Details:

• Valid Activation: You can still play the card (for example, to trigger an "on spell cast" ability), but the unit will remain in the Lair.
• Movement Restriction: Vilemaw's Lair prevents all forms of movement to the base, including those from card effects like Fight or Flight.
• Recall vs. Move: Note that "Recall" effects (such as Zhonya's Hourglass or end-of-combat cleanup) are not considered "movement" and are therefore not blocked by Vilemaw's Lair.