When Kayn attacks one battlefield, is moved to another battlefield via Yasuo's ability (where he doesn't conquer), where does he return to - his original battlefield or base?

Ruling: When attackers fail to conquer a battlefield (defenders are still present after damage), the attacking units are recalled to base, not to where they came from.

Sequence:

• Kayn attacks first battlefield
• Yasuo's ability moves Kayn to second battlefield
• Kayn deals damage but fails to conquer (defenders still present)
• Kayn is recalled to base

Nuances:

• Yasuo can only move units to and from base, not directly between battlefields
• Ganking does not expand the capabilities of movement effects; it only modifies the Standard Move
• If Kayn moves to a battlefield with defenders, he will deal his damage but be sent back to base if he fails to conquer