If Kayn moves twice in one turn and the second move is to a battlefield with a Hidden Blade, does Kayn die? (Does killing a unit count as damage?)

Ruling: Kayn dies. Only damage counts as damage, so killing a unit does not count as damage.

Nuances:

• Kayn's ability protects him from damage on his first move each turn, but does not protect him from being killed by other effects
• Hidden Blade kills rather than dealing damage, so it bypasses Kayn's protection