If Teemo stands still and takes no actions for 1.5 seconds, he becomes stealthed indefinitely. After leaving stealth, Teemo gains the Element of Surprise, increasing his attack speed by 20 / 40 / 60 / 80% for 5 seconds.
In addition, moving inside brush for 1.5 seconds also allows Teemo to become stealthed.
I love ambush, once Xin were full health and i had something around 100 and he attacked turret and I was behind him and then I attacked to him and get kill, and I only took 10 damage from mobs
It is funny to go stealth against people who don't have AoE spells though