In 2v2, if you play Charm and move an opponent's unit into a battlefield controlled by the other opponent (their teammate), does this start a showdown between them?

Ruling: No, you cannot play Charm to move an opponent's unit to a battlefield where their teammate has units. The FAQ clarifies that you can never have units at the same battlefield as a teammate, so this play would not be legal.

Nuances:

• Control of a battlefield is not shared between teammates in 2v2
• The restriction prevents the play entirely rather than triggering a showdown