Livy reports the same silly 'flying-up-to-heaven' trick with Romulus.
T. Livius "The Early History of Rome"
Apparently, this was somewhat expected behavior in the ancient world.
Quote:Having accomplished these works deserving of immortality, while he was holding an assembly of the people for reviewing his army, in the plain near the Goat's pool, a storm suddenly came on, accompanied by loud thunder and lightning, and enveloped the king in so dense a mist, that it entirely hid him from the sight of the assembly. After this Romulus was never seen again upon earth. The feeling of consternation having at length calmed down, and the weather having become clear and fine again after so stormy a day, the Roman youth seeing the royal seat empty -- though they readily believed the words of the fathers who had stood nearest him, that he had been carried up to heaven by the storm
T. Livius "The Early History of Rome"
Apparently, this was somewhat expected behavior in the ancient world.