Seems like they're preparing a new part of Time Temple.

Well, if you fly downwards to the bottom of the travel map that spans the distance between Leafre and ToT, you automatically untransform from your dragon morph and drop.... all the way to Leafre.

And survive.

We're assuming that Maple physics is constant, though.

I wouldn't use in-game mechanics to justify story elements.
It's Aerith syndrome.

I mean, compare falling all the way from the Temple of Time to (edit: falling from the top of Kerning City).

Clearly the dragon bros didn't, lol.
I'm just wondering, if you think it's Evan, how would he be fighting the black mage if nobody knows exactly how to get to the black mage at this point in present time.

:T

Because it's a trailer.
Why were Aran, a Battle Mage, a Mechanic, and a Dual Blade fighting on top of a roof?
Or, it could even be a preview of what is to come.