I think they're separate. Considering the other vid, I think that big clash is like the intro of the fight. The come in, say their intro, then the fight begins by them running forth and clashing.
Loving the way the combat looks right now... but that little elevator cutscene in the middle of a fight is going to get super old, super quick. lmao
Harley looks really awkward to use just from seeing these small bits of gameplay. I also noticed that Grundy has Jax's ground pound. And Batman has like a reverse scorpion spear... it brings batman to the enemy! LOL