In 2v2, can a player with Yasuo move their teammate's units from the battlefield to the teammate's base?

Ruling: No, a player cannot move their teammate's units to their teammate's base. If the ally has Heimerdinger, that ally (not the Yasuo player) can move their own units to and from their own base.

Nuances:

• Heimerdinger's ability allows the Heimerdinger player to move their own units
• The Yasuo player does not gain control over their teammate's units or base interactions