Aura

Before dealing with Aura, let's think a little first. 

What is the Aura? What are the differences between Aura and Mana? 

We need those two questions first.

In the game, it wasn't explained in too much detail. Moreover, since I had yet to feel what Aura feels like, I don't have anything I can refer to. 

However, there are some known differences between Aura and Mana. The first difference is the source of one's Aura is their own body, while we can't basically create a Mana out of nowhere. 

To use magic, one needs to condense the mana particles around the environment into their core and then direct it. This means, basically, we are borrowing the mana particles around and moving them, which means a person with better control of mana would be able to interrupt another person's magic if analyzed properly, albeit it is still difficult.