If someone plays Prison Rune on Green Yasuo, will his activated ability still trigger?

Ruling: Yasuo will still do ability damage when Prison Rune is played on him, just not combat damage.

Nuances:

• Prison Rune cannot be played in response to Yasuo moving to conquer because Yasuo starts the chain and no action can be played during that
• If Prison Rune is played during the Focus step, Yasuo's ability would have already triggered
• The scenario can occur if Prison Rune is played defensively during combat, then Yasuo is moved to another combat using move effects (like Ride the Wind), where the stunned Yasuo can still use his ability damage to kill units and conquer