Calling is just a name for this kind of help. Generally speaking, the basic address is sometimes the sea, sometimes the house, and there are many variants.

In addition to shouting, there are also alarms ppph and so on. Generally speaking, it is to wave a light stick with the rhythm of music, and then shout out some auxiliary words at the end of a specific sentence. There are many specific divisions. It is suggested that if you want to learn, you can directly search for Japanese-style supporting videos, which are quite detailed.

Personal hand is not standard, please forgive me.