Aryan notes down every detail that the class teacher is explaining to everyone. Even in the textbook, he was not able to find that much information that his class teacher was explaining to everyone.
The class teacher told him all the habits of that Monster and also the tactics to defeat those Monsters. Fighting those Monsters inside underwater would be dangerous.
You need to have poison resistance ability, you need to have the ability to see underwater where even sunlight is unable to reach. You needed to have the ability to breathe underwater as you did not know how long you needed it to stay inside the water. Most importantly you need to have a technique that will help you attack inside water without any problem.
If inside the water you want to use the flame Sword technique or anything like that, then it would not be useful. Underwater using any kind of weapon becomes very hard. So everyone prefers to use spells inside underwater.
