The frequency of the swords clashing against each other made it seem as if someone was conducting a military firing drill. The sounds originated from the battle between none other than Leo and Erin.
Erin was being the aggressor in the fight, as she constantly pushed forward, swinging her blade time after time again, but no matter how hard she tried Leo managed to block each strike with a little assistance of his soul weapon. However, he didn't just block them, no he simultaneously guided Erin's aura to focus on certain areas.
'My guess seems to be correct, I have never seen Erin move this fast before. As a vampire knight trained in Qi my speed doesn't lose out against the other vampire leaders, yet somehow she is able to keep up with me, which can only mean one thing. She must have evolved!'
