User blog comment:DoctorAsawa/Sebastian, the Drumbeat of Freljord/@comment-8267817-20130509154211/@comment-8267817-20130510144339

if it didn't refresh though they would go up to +20 the first second, +30 the second that third second then it would reset at +0 because the buff would wear off and need to stack again, it would make his speed assist very inconsistent, by making it refresh and stack once you hit +30 you would just stay at +30 unless you left his range and it wore off