Part of Rey's Sudden Whirlwind ability reads as follows:
"This ability can't be used unless a Light Side ally dropped below 60% Health since its last use. A Light Side ally needs to have dropped below 60% Health in order to use this ability for the first time."
So why is it not usable if a Light Side Ally is on 61% Health or more and then defeated in one hit?
If a character drops to 0 Health, that is less than 60%, surely?