Can you play a hidden Tideturner from a different battlefield to swap with a unit being contested on another battlefield?

Ruling: Yes, you can react by playing your hidden Tideturner from Battlefield B to swap it with your Yasuo on Battlefield A, saving Yasuo and sacrificing the Tideturner instead.

Sequence:

• Opponent pushes unit to contest Battlefield A where your Yasuo is defending
• You react by playing hidden Tideturner from Battlefield B
• Tideturner swaps positions with Yasuo
• Yasuo is saved, Tideturner is sacrificed in the contest