With Xin being who she was, she had faced many different types of Altered, but going up against Gil was the most unique one yet. For one, he was a rare Mythical type. There were some of these in the AFA, but she hardly got to see the full extent of their power. The Mythical types had great power and a chance of great elemental ability as well.
Not only that, but she had seen something somewhat unique to an Altered which she hadn’t seen before. The fact that Gil was able to transform his body, and in doing so, it affected his powers.
Being large in size, he was strong and durable, while being smaller in size he had incredible speed. It was because of these transformations that Xin had felt like she had already seen it all.
They had been fighting for a while now, so he had to have used either his partial or full transformation. There was nothing left for him to show, with no surprises, it was time for her to finish off the fight herself.