In the Deathly Hallows:
"No, he's not dead," said McGonagall bitterly. "Unlike Dumbledore, he was still carrying a wand...and he seems to have learned a few tricks from his master." With a tinge of horror, Harry saw in the distance a huge, batlike shape flying through the darkness toward the perimeter wall. (DH pg 599/482)
In the Goblet of Fire:
“Maybe he didn’t want you to get there!” said Ron quickly. “Maybe - hang on - how fast d’you reckon he could’ve gotten down to the forest? D’you reckon he could’ve beaten you and Dumbledore there?” “Not unless he can turn himself into a bat or something,” said Harry. “Wouldn’t put it past him,” Ron muttered.
So I always assumed Snape transformed into a bat when he jumped.
Then I saw on this site and wikia that many people think he could fly like Voldemort.
My question is: is there canonical proof that Snape could fly without metamorphosis?