Can Tideturner swap positions with a unit in Vilemaw's Lair, and if so, what happens?

Ruling: Tideturner can target a unit in Vilemaw's Lair, but upon resolution Tideturner cannot move out of the lair. Under the "do as much as you can" principle, the targeted unit would move into the lair while Tideturner stays there.

Sequence:

• Tideturner targets a unit in Vilemaw's Lair (this is legal)
• Upon resolution, the targeted unit moves into the lair
• Tideturner cannot move out of the lair (units cannot move from lair to base)
• Tideturner remains in the lair

Nuances:

• The interaction relies on the "do as much as you can" principle (DAMAYC/Silver Rule)
• Units are not allowed to move from the lair to their base, which prevents Tideturner from leaving
• The contributor noted they would rule this way but were open to disagreement