GRAOOOAWLLL... The thing, or rather the Dark Ghost gave a piercing cry that shook the very air in the vicinity. Then, on Lai Zemin's order, it fixed its attention on Yang Chen.
The latter sensing the danger, was about to make a 180° retreat when Amon spoke up.
"Although this thing is dangerous, there is a way. This thing hasn't completely become a demonic beast. There is still a human part within it that is constantly trying to resist the corruption"...
"As a result, the soldier's control over that thing is also not perfect. If you stall it for a while, the effect of whatever that is controlling that thing should wear off, and the beast will go out of control".
Stall or retreat, Yang Chen weighed his options. In the end, he decided to heed Amon's words and stall. In any case, letting such a dangerous enemy loose would only end up coming to bite him later.
It was much better for him to take out such an enemy here before the two girls encountered it.