The term gihap has nothing to do with shouting. That's basically an elementary school usage of the term.
氣合/기합/gihap means to coordinate breathing and mental focus with physical motion into a decisive overt action.
The militant shouting taught in forms is a left over from the early days of Taegwondo's formation and Japanization of Okinawan karate.
Shouting while attacking could be used as an attempt to bring that clarity of thought and action together, but ideally, it wouldn't matter if you shouted or not. Arguments about which move in a given form one should shout on completely miss the point.
氣合/기합/gihap means to coordinate breathing and mental focus with physical motion into a decisive overt action.
The militant shouting taught in forms is a left over from the early days of Taegwondo's formation and Japanization of Okinawan karate.
Shouting while attacking could be used as an attempt to bring that clarity of thought and action together, but ideally, it wouldn't matter if you shouted or not. Arguments about which move in a given form one should shout on completely miss the point.