Absolute confidence!
It means: even if the butcher knife is on my neck, I will laugh at the sky. The comrades who fled or stayed behind were all heroes like Kunlun Mountain.
Another understanding is: I have passion, passion; Smile proudly, awe-inspiring execution ground! What will be left is the courage and courage like the vast Kunlun Mountains!
In a word, no matter which explanation, it expresses the poet's death, heroism and generosity. It is that strong sense of sublimity and tragedy that inspires the poet's fearlessness of death and awe of the execution ground.
Of course, Mr. Lu Xun's "I recommend Xuanyuan with my own blood" is also very emboldened!