Fire Dragon+Thunder Dragon

Look at it from my perspective. User with almost no contribution history makes an apparently spontaneous round of changes to new content pages that most of the player base is still busy salivating over. Looks, on the surface, like it could be disinformation. Better to err on the side of caution, you see?

When inaccuracies show up (because they invariably do), the wise thing to do is to bring up the issue on the article's discussion page before making any changes. Ideally, that serves two purposes: one, it brings the alleged issue to the eyes of more editors, making it more likely to be examined in detail; two, it allots you a space in which to validate your assertion. Changing the content of an article completely out-of-the-blue is not something to do with the expectation that no one will question the merit of your changes!

Your edits were reverted for a lack of evidence, not because I believed them to be erroneous. That is why the edit summaries contained "please substantiate." I cannot say with any certainty how fast dragons move. I have not examined the movement speed or mounted combat mechanics of Dragon pets in detail. From the perspective of a reader, neither have you.

All I'm saying is that if "it is actually a well known fact" as you claim, you should be able to show us something to back that up.