The cat may have been stimulated or frightened at some point elsewhere, but it cannot be immediately reported at that time. After a while, if you change the space, a clear attackable target appears, and the target will be beaten inexplicably.
If your cat, Gangdan, squatted on the windowsill, saw a wild cat jumping into your courtyard through the glass and provoked the bell. Even if it is not provocative, Gangdan'er may feel uneasy because she smells the stranger of other cats.
At this time, once Gangdan'er had the intention to attack the other party, he was powerless and could only hold it in and be anxious. And if Jasmine, another cat in your house, passed by the windowsill where Gangdaner squatted, Jasmine would probably be attacked by Gangdaner.
Jasmine may be confused and have no idea what happened. Jasmine may get along very well with Gangdaner. They are kittens born in the same litter, which is not easy to use. Moreover, redirected attacks have certain memory and conditional emission principles.
It is very likely that Gangdaner attacked Jasmine once, and Jasmine escaped, but afterwards, even if Gangdaner discovers Jasmine again in another place, Gangdaner may continue to attack Jasmine. Therefore, as a parent, if you do not discover this problem in time, Jasmine may be depressed and have been inexplicably attacked by Gangdaner when you are not at home. Jasmine will also cause a series of joint problems if she is not full and drinks enough.