We feared actually that our blind kitten might scare some, because the toy anyway is quite noisy, but funnily enough the hit with her not to - but it at our second cat may well see. Now they play always as follows:
First Cat (blind) plays so hard with the toy until she succeeds after about 20 to 30 minutes to separate the bar from the toy. Tired and proud of their success if she lies down on the sofa to rest. Now the second cat comes (which can be seen) - since the stick is no longer there, it makes the device no longer so afraid, and they now chasing this tiny stubble, which rotates under the blanket on which so normally the rod inserted.
That's why I'm not going to stick the stick, just as some have done, according to assessment, but simply put it back on for the next time - then both cats have their fun with it!