Does a unit heal when it moves to an uncontested battlefield via Hextech Ray during a non-combat showdown?

Ruling: Units only heal at end of turn or at end of combat. Moving into an empty battlefield causes a showdown but is not a combat, so no board-wide heal occurs.

Nuances:

• If you react by moving a unit into that battlefield (e.g., with Ride the Wind), a combat will occur as part of the game flow, which would then trigger healing
• Simply reacting with a spell does not initiate combat