The possibility of the noise coming from a stray cat, or a thief entering the house was completely zero! After all, with all those formations around even a Rank 5 or Rank 6 Master wouldn't be able to enter unscathed.
So, they didn't need to think hard to understand where the noise was coming from, and how difficult things would be to deal with if they ignored it.
For that reason, Roy immediately activated his camouflage, while Kate turned to look at the door. The play was simple, Kate would try to capture the guy's attention, while Roy struck from behind.
There was no need for honor and righteousness in this fight because there was no fair fight in this world, only hypocritic duels that hypocrites would stage to show their hypocrisy.
What could actually be called equal anyway!? From the moment that we are born everyone is different, someone is healthier, someone has blue eyes, someone has no hair.
Nothing is equal, similar, or identic!