This is not hard any non idiot can do it. As a rogue you just trinket a CS blind your enemy wait for trinket / global vanish, You can even see there character move there hands if you are watching carefully look up mahikoson, buddhist, neilyo, and akrios in there videos you will see everything from vanishing blinds to pom, death coils you name it they can vanish it. And as a caster it's easy aswell you anticipate the vanish so you start casting a spell to break the vanish or just keep a dot up it's not like they have cos at 39, But sometimes you can lag and get owned because you don't see the spell coming and by the time you see it and try and vanish it just takes you out of stealth. Kebinds help for sure for quickest reaction.