Avatarika
तौ ह पुनः प्रजापतिरुवाच च्छायात्मनिश्चयापनयाय-
In plain words
Prajāpati spoke to them once again, specifically to dispel their mistaken conviction that the shadow-reflection is the true self.
Close to the Sanskrit
Prajāpati spoke to those two again, for the removal of the certainty of the shadow-self.