Passage: In the other version, Nerites was loved by Poseidon and answered his feelings. From their mutual love arose Anteros (personification of reciprocated love). Poseidon also made Nerites his charioteer; the boy drove the chariot astonishingly fast, to the admiration of various sea creatures. Helios, for reasons unknown to Aelian's sources, changed Nerites into a shellfish. Aelian himself supposes that Helios might have wanted the boy for himself and was offended by his refusal. As in the first version, Nerea found her brother and successfully persuaded Poseidon to restore Nerites to his true shape.

Question: How did Nerites drive?
astonishingly fast