Yang Changhong was unwilling to test her "Mind Slash" Awakening on Wang Tao; other people might not be able to withstand it, and even if they did, there could be problems. After all, this was a spiritual attack that could directly affect one's consciousness. Caution was needed... so in the end, she decided against it.
She would have to leave the city eventually, at which time finding some zombies or monsters to test on would suffice.
From Yang Changhong's reaction, it was clear that her Awakening was likely powerful—although she had just awakened and was unfamiliar with her own abilities, she instinctively felt that this was a pure attacking ability better left unused in sparring, since each move was potentially lethal.
Wang Tao handed out some Awakening Crystal Cores to Yang Changhong, and also to others who had just awakened.