User blog comment:ClariS/My Champion Remake: Kayle/@comment-4849897-20120406023630/@comment-4881935-20120406040226

Ops, I forgot to put the limit on her Q. It's only suppose to max out after 5 strikes, making the total slows being 45/50/55/60/65%. The flat movement speed reduction is not much different from the percentage, instead, making it more effective early game. I think the percentage is fine as reaching the max duration will be hard and take time (like Nasus's slow). So most times, the max slow will last only around 1 second.

I'll think about changing her passive. I might revert it back to 3%.

About your idea for support, it sounds like a rather complex speed boost for your teammates. Also, in retrospect, decreasing the speed of one person will have the same effect (in many cases) be the same as increasing the speed of everyone else.