If a Hidden unit (Purple Teemo) is flipped in response to a Deathknell trigger during combat cleanup, does the attacking unit bounce back to base per rule 181.4.a?

Ruling: This interaction is currently unclear and awaiting official clarity.

Nuances:

• Deathknell triggers occur when the unit hits the trash (after cleanup)
• The timing of when the battlefield is considered conquered versus when Deathknell triggers creates ambiguity
• This scenario (flipping a Hidden unit in response to Deathknell) is the primary way the combat outcome could change after damage but before combat resolution completes
• Deathknell effects don't trigger if the unit is saved by effects like Zhonya's or Sett legend effect, confirming they require the unit to reach the trash