After all, they knew that if the Nascent soul left the body before it was truly dead, Childe Wildlife might lose his cultivation base in the best case, and his life in the worst case.
Something like this was rather rare and only happened when the body was damaged beyond a limit when using Dao Embryos and Dao Skills.
Such was the strain that was put on one's body due to them. That was the reason why cultivators were not supposed to use the skills lightly. And using them should also be done within limits. If they didn't the consequence of it were lethal.
Lin Mu had seen this several times before back in the Xiao Fan world when the elders of the Northern Tribes used their shared Dao skills.
Thankfully, Childe Wildfire was in the best possible place to get injured like this.