When Zhonya's Hourglass is played from hidden at a battlefield where you lose control (due to having no units remaining), does it stay at the battlefield or move to base?

Ruling: When Zhonya's Hourglass is played from hidden, it is instantly recalled to base before other effects resolve, regardless of battlefield control.

Sequence:

• Zhonya's Hourglass is played from hidden in response to a bounce spell
• Zhonya's is immediately recalled to base (before the bounce spell resolves)
• The bounce spell then resolves

Nuances:

• Gears can only exist in your base
• Zhonya's being recalled to base allows it to save units at any battlefield, not just the one where it was hidden