Fastfins are not afraid of eels. Normally, all dragons are afraid of eels but not fastfins. However, Summer is a fastfin and she is afraid of eels. Why? When she was little, she was playing with her friends in an ocean. Her friends swam away and when she turned to follow, there was an eel and it bit her. And that is why Summer is afraid of eels.
(When my dad was little, a rooster attacked him and then for a long time, he was afraid of any birds that came near him.)