C1074 Liuquan
The degree of the heavenly river being frozen was enough to freeze a person's internal organs. Once the glacier cracked, that person would also crack along with it.
In other words, after this ice crack, Chu Tian would face a life and death crisis.
Of course, if this ice river's cold qi could not threaten Chu Tian and did not freeze him, then it would not be a threat to Chu Tian