Shako should have an alert
That shako invisibility is not balance.. At least with Rengar you know he is in the area.. shako can sneak up on you and if he doesn't kill you in 2 seconds, shortly thereafter, he can either disappear or duplicate himself.. then kill you.. riot should consider at least giving you and indication that you are about to get instantly killed by some champ that require very little skill.
muwahahahahaha
well... at least twitch has a delay