Well, there are various types of fighting scenes. For instance, in fantasy-themed manga anime, when magic users clash with fierce monsters, the force of the impact might cause their clothes to tear. Or in martial arts-based ones, intense hand-to-hand combat can lead to ripped clothing as the fighters exert maximum effort.
Maybe it's for added drama and excitement. The ripped clothes add a visual element that makes the fights seem more intense.
It could be for creating a visually appealing or dramatic effect. Sometimes it adds an element of surprise or tension to the scene.
There are many types. Like superhero cartoons where heroes battle villains or martial arts cartoons with characters having intense duels.
It could be for shock value or to add drama and tension to the story.
This could be for shock value or to add a dramatic element. But it's not a good or appropriate representation.
The notion of cartoon girls having their clothes ripped off is not a good one. It goes against principles of respect and appropriate representation. Such imagery can be harmful and should be avoided.
Maybe it's for adding some drama or to show intense action scenes. Ripped clothes can make the situation seem more dangerous and exciting.
There are various cartoons that might have door opening scenes. Like in adventure cartoons, when the hero enters a new place. Or in comedy ones, for funny surprises.
I'm not familiar with any anime or manga that has such a bizarre scene as you described. Most works in this genre are known for their diverse and engaging plots, rather than something like this.
To understand the fights in manga chapter 1, look at the panel layout and the way the action is sequenced. Also, notice the visual cues like special effects or speed lines to grasp the dynamics.