Great River Flows To The Sky
An aura is just that. It's a psychological pressure built up by your level. They are all so used to the idea that their aura can suppress a lower level enemy they forget that if you simply ignore it or manifest your own unique aura, this pressure is meaningless to a genius. then the difference between power levels shrinks until better comprehension bridges the gap. that's why killing intent auras are considered the strongest as it strikes the fear of death in the enemy and makes them subconciously feel that they are weaker and thus they cannot show their true strength.
Think of auras like level 2 dao has 7 aura points and level three only has 6 points. that's means the lvl 3 feels like the enemy has a 100% greater advantage over you. But you at lvl three have such self-confidence you add 1 or 2 points to your own aura, you can ignore the enemy's aura and even put pressure of your own on him. Now the the only issue you have to deal with is the energy and comprehension difference.