Aerial attacks shown to clash in SSB4

[Sunnysunny]

http://www.youtube.com/watch?v=qJmzalIXRKw

At 00:21 in this video, Mario and Megaman both F-air each other at the same time, and end up nullifying each others attack.

In brawl, very few aerials actually clash. Instead, when an aerial makes contact with another aerial, they just trade damage.

I know the game is still ridiculously early in development and this might not be in the final game, but just something that caught my eye in this battle.

 

[DefenseTech]

I was wondering this as well, does it happen anywhere else in the video?

 

[Gardex]

Noticed this as well.
A couple of possible ideas:
1. This might be a special case like the "article" moves in Brawl(like ZSS nair iirc) which can clash. Even more likely considering how MM's fair looks.
1,5. Mega man's fair could have item-priority like Olimar's pikmin, and can thus clash.

2. The hurtboxes might not have actually touched at all, and they simply just went through each other.

3. Aerial clashing confirmed