Raguna was surprised by how Elaina easily deals with the worms that plague the World Tree. They have fought the monsters before and they knew how difficult to beat one up considering that they have to constantly fend them off. The most potent way to deal with them is to attack them with Windblade magic and mince them up but they cost a lot of mana, causing most of the fairies to interchange roles just to have the one who attacked first to rest and recover their mana before they can return to the role and do it again.
But Elaina is just doing it all alone, without magic, and still decimating everything without trouble. She was not showing any struggle with them whatsoever.
"H-how are you doing all of this?! Aren't you a farmer?"