to put it simply: she threw the wooden shield at him knowing he would use water barrier, the broken pieces of the wooden shield get “stuck” in the water barrier. if the prince gets rid of the water barrier the wooden pieces will hit him so he can’t cancel the barrier. however the barrier uses up mana really fast so Sophia just has to wait until he runs out of energy to win. the cocky dumb prince gets angry and cancels the barrier to attack her but obviously he loses. sore loser that he is, he drinks a mana potion and suddenly tells her to use a different type of magic or it doesn’t count as her win. he gets cocky again and casts multiple spells at her thinking he’ll win, but Sophia (as the original creator of the water barrier magic) reminds him that spells of the same type cancel each other out. the blast knocks him back i guess. Sophia wins the duel since the prince doesn’t get back up

Someone please explain to me what happened in ch 9 and 10 in dumb dumb terms because I don't understand