Delayed reaction on taunts (especially on Shen)

Been playing Shen a whole lot lately. I noticed that his taunt is bugged because he will taunt them for the prescribed 1.5 seconds (the taunt icon appeared over affected target(s) heads) but they are only taunted for half that time. They continue whatever actions they are doing for .75 seconds then they launch a single auto attack and go back to running away or whatever it was they were doing prior to the taunt. So either the ability description needs to be updated to be a more honest reflection of what actually happens or you have to fix the bug that occurs when Shen does his shadow dances.

tl;dr: Taunting an opponent doesn't crowd control the enemy as long as it states it does.

Sidenote: I don't own Rammus but if someone wants who does own him wants to look into this for me that would be great.