in my head, the reason there is 4 pearls instead of 3 is to give this idea to percy that he canāt save everyone. That he can go and save his mother but in reality, one of the pearls might get destroyed. thatās why we hear percy say that they need to go back without him. Heāll try and sacrifice himself BUT, depending on how they do this, in the book, percy leaves sally because he knows thatās what she would want him to do. to save himself, his friends, and the camp first.









