Yep, it applies on attacks. Funny enough, if you get slowed by holy freeze or decrepify, your leap animation will also be slowed down in the same manor, leaving you pretty vulnerable to extra attacks
So nice in tvt when my vt was in team with a nec, basicly charge-tele-smite and barb would die as he landed on floor.
Leaving nec/hammer/bowa without propper stun as protection.
Then i was all about a fast unsuspected jump to destroy amped ama.
Now multi wont destroy my oak and i can time it and delete hammerdin with a amped oak jump.
Next we all hunt down that necro.