that's why i play top lane cause only actives i use are randuins (i still think it has attack speed debuff on active
so I wasn't the only one that thought this
after looking at what it said, I think it only slows movement on the active
the attack speed slow + movement slow is on the passive
so I guess it's not quite as good for protecting the team as if it had the attack speed slow, but that's what the frozen heart is for?