Does Master Yi's +2 Might apply before Yasuo's attack ability kills him when both are at 7 Might?

Ruling: Master Yi's +2 Might applies before Yasuo's ability resolves, making Master Yi 8 Might and surviving the combat. The passive kicks in as long as Master Yi has the defender designation and is alone.

Sequence:

• Master Yi gets the defender designation at the beginning of combat
• Master Yi's passive applies (becoming 8 Might) because he has defender designation and is alone
• Yasuo's attack trigger resolves

Nuances:

• Even if Master Yi were a triggered ability rather than static, it would still resolve first because defense triggers go on the chain after attack triggers