When Hostile Takeover takes control of an attacking champion (like Yasuo, Anivia, or Warwick) after their Attack Trigger is already on the chain, how does the trigger resolve?

Ruling: The opponent retains control of the ability and makes targeting choices, but target legality is checked from the perspective of the ability's source. Yasuo's ability will fail because his previously-enemy target is now a friendly unit and he cannot damage friendly units. Anivia and Warwick's abilities resolve normally, affecting units belonging to their original controller (now enemies from the source's perspective).

Sequence:

• Champion attacks and Attack Trigger goes on the chain
• Hostile Takeover resolves, placing the champion under Renata player's control
• When the Attack Trigger resolves, the opponent still controls the ability
• Target legality is checked from the source's perspective (the now-controlled champion)
• For Yasuo: the target is now a friendly unit, so the ability fails to resolve
• For Anivia/Warwick: their abilities affect units belonging to the original controller (now enemies)

Nuances:

• Control of the ability does not change when the source changes control
• Target legality is checked through the first-person perspective of the ability source, not the ability controller
• Hostile Takeover recalls the champion at end of turn, not immediately upon taking control