Hey my german is very bad but what i can understand you are asking if there is a possibility of someone mining in an instant and then leaving again without u seeing them? If that is what u are asking the answer could be a yes. But it would be easily detected by Warden (WoW's Anti-Hacker / Bot Detection Program) The way this could be possible is easy. You would simply need a system of tracking where nodes spawn, a teleport hack (very easily detected), and a script that clicks based on color. (Like a fish bot to detect bobber) U can find the locations through free addons on

, and a teleport hack can be found through a little looking but like i said earlier they are easily detectable so use caution!, to find the color u would need some advanced skill with scripting, or hex programing to find the memloc for the color of the node you want to farm.
So to wrap things up it can be done but it would be an advanced bot, with a high chance of getting caught regardless of the time of day because Warden will detect suspicious activity. Once red flagged u are gone!
Hope This helps. Sorry its in English.