Do all units heal after a showdown, or only the units that participated in that showdown?

Ruling: All units everywhere heal at the end of a combat showdown or end of turn. Units do not heal after a non-combat showdown.

Sequence:

• A unit can take damage from a challenge
• If another unit initiates a combat showdown (not involving the damaged unit), the damaged unit still heals at the end of that showdown
• The healed unit can then participate in a subsequent showdown at full health (if readied or moved by an effect)

Nuances:

• Only combat showdowns trigger healing for all units; non-combat showdowns do not trigger healing