Hail of Blades keystone does not activate when attacking enemy champions with Shen's empowered Q. Regular attacks activate the effect.
Shen can use a normal auto attack to activate HoB and then use Q to empower following attacks to benefit from HoB. Trying to activate HoB with an empowered attack does not activate the effect, HoB ready state is not consumed until you attack with a regular attack.
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