Axel could hear the beastly cries and screams of the sea creatures as they fell from such a height back into the waters. It was a saving grace that these creatures were mainly of the 'Monster' category, meaning they were physically powerful creatures with even their abilities leaning towards that direction, most likely.
Creatures with magical abilities tend to be more dangerous to deal with, as they are smarter in general. He especially commanded everyone to be efficient with their energy and try not to shoot down the creatures that weren't high enough.
With every creature that fell down, Axel had noticed that every time a creature fell back into the waters, its screams grew louder, its skin sizzled and burned. He narrowed his eyes; it seems to be a kind of poison that works by causing immense burning pain to the creatures. Of course, it did that.
