If Facebreaker targets a friendly unit and an enemy unit at the same battlefield, but one unit is moved to a different location (via Fog of Fate or similar effect) before Facebreaker resolves, does Facebreaker still stun any units?

Ruling: Yes, Facebreaker will still stun the remaining valid target. Because Facebreaker uses "at the same battlefield" as a group restriction (not targeting a specific battlefield), when one target becomes invalid or moves, you can choose from the remaining valid targets to stun.

Sequence:

• Facebreaker is played targeting a friendly unit and an enemy unit at the same battlefield
• Before resolution, one unit is moved (to hand, base, or different battlefield)
• At resolution, the remaining valid target can still be stunned
• If both targets end up at separate battlefields, you choose which battlefield to act at and stun that unit

Nuances:

• This ruling applies because "at the same battlefield" is a group targeting restriction, not a target itself, which allows the spell to resolve with a subset of valid targets per rule 352.11.b
• This differs from spells like Fox-Fire that target "a battlefield" specifically, where units must remain at the chosen battlefield
• The distinction is between "units at a battlefield" (targets a specific battlefield) versus "units at the same battlefield" (restriction on the group, but no specific battlefield targeted)