If a combat showdown begins but one player uses Flash to move their unit away during the combat process, does the combat still complete and heal the unit that left?

Ruling: Yes, once a combat showdown process has started, it continues to completion even if one side withdraws their unit early. All units that participated heal at the end of the combat process, including units that were moved away during combat.

Sequence:

• Combat showdown begins when Mountain Drake moves to battlefield
• Player A plays Hextech Ray on Mountain Drake during combat
• Player B plays Ride the Wind (Flash), moving Mountain Drake back to base and readying it
• Combat process completes with only Mega-Mech remaining on battlefield
• Mountain Drake heals to full health at end of combat
• Mountain Drake can return to battlefield at full health

Nuances:

• The combat process does not stop or cancel just because one side pulls their unit back early
• Units heal at the end of combat regardless of their current location