Do units heal after a showdown during combat, and does spell damage persist until end of turn?

Ruling: All units in play heal after combat (which includes showdowns that occur during combat). Units also heal at the end of turn. Showdowns that occur outside of combat do not trigger healing.

Nuances:

• Healing after showdown only applies if the showdown is part of combat
• The healing applies to all units in play, not just those involved in the showdown
• In the described scenario with Kaisa and Darius, if Ride the Wind moves Darius during combat and the first showdown resolves, both units would heal after that combat showdown