When Kayn uses his second move (ganking) to attack Tryndamere who has 8 might, and Kayn takes no damage, what happens to Kayn?

Ruling: Kayn recalls to base.

Nuances:

• The current rules for recall don't explicitly specify where the unit is moved to, which creates ambiguity for Kayn's ganking ability (whether he returns to base or to the battlefield he came from)
• This interpretation may change pending rules clarification from Riot
• The general rule is that if units from both players remain on a battlefield after combat, attackers get recalled to base