master yi's utlimate dosn't decrease in cool down in the crystal star map after getting a kill....all his spell's cooldown goes down by 70% except for his ult. im not sure if this is done on purpose for balancing, or its a bug.
Passive: Champion kills and assists reduce the current cooldown of Master Yi's basic abilities by 70%.
Active: For 10 seconds, Master Yi gains increased movement speed and attack speed, and becomes immune to all slowing effects. While active, >champion kills and assists extend the duration of Highlander by 4 seconds.
Looks like it is intended
