Raiya didn't need to have her manalysis activated to know that these brothers were operating under aura harmonization. Although, she did briefly activate her manalysis to take a look at exactly how closely harmonized they were. Their manawaves were vibrating at almost the exact same frequency. Raiya couldn't actually tell how closely their auras were harmonized because her manalysis wasn't keen enough. But it was clearly passed the 90 percent similarity threshold. This meant their spells would be amplified at least twice as potent as they would have been normally. The mana waves resonated back and forth between each of the brothers, reverberating, creating a constructive interference. 

Watching the two operate so efficiently was really a bit impressive. Aura harmonization was extremely difficult. Mainly because, if you and your partner were not on the same wavelength, the result could create a destructive interference instead of a constructive interference. Which meant for a bit, you and your synchronizing partner would have less power than you would normally have. Even after breaking harmonization, if you messed it up, your power would not return to normal until up to twenty-four hours. Aura harmonization was truly a gambit, utilizing it in battle was a matter of high-risk moderate reward. 

They rushed Nemo and Raiya, zigging and zagging up to them in a flash. Luckily Raiya's heightened senses allowed for a super human reaction time. Activating her biri-biri aura briefly, she lept slightly backwards, the sword swipe narrowly passing in front of her. Immediately after she shot a quick burst of 4 rounds at the long haired brother, moving her aim with each shot. The shots were evenly spread out. The first started at the left leg/femur and the last ending at the middle of the forehead (if the shots managed to land). Reguardless, Raiya spun adding momentum to her swing, and aimed a kogatana jab right at torso of the long-haired brother.