 According to another version, the monster was chained up in the open sea, under the stones of the Roc'h Ruz (Red Rock) reef opposite Plestin-les-Grèves, from where the monster vomited his blood.This legend, which marks the victory of Christianity over paganism, probably stems, according to Louis Le Guillou, from a fear due to the drowning of travelers in this bay, which was likened by its dangers to that of Mont-Saint-Michel.Swept away by the rising tide, which "rises at the speed of a galloping horse", it was the location of the great royal road passing on the beach from Saint-Efflam to Saint-Michel-en-Grève.