Leonie did not like creepy crawly things.
They reminded her of spiders, and spiders were not good. They were really hard to kill; not physically, but mentally. Just trying to make yourself squish down on those big, round, shiny abdomens... Leonie shivered.
So she condensed the air around Rlyan into water, creating a sort of bubble. Hopefully the creatures would drown faster than he would.