Why Do Daityas not escape Like Devas

 O King! It is now your paramount duty to fly away and save your life; if you live, you may have the chance for gaining the victory when time will turn out favourable; there is no doubt in this. 

It is Time that makes a strong man weak; and it is that very Time that makes that weak man strong again and stimulates him for victory. Time makes a generous donor a beggar and it is Time that makes the same beggar again a generous donor. Brahmâ, Visnu, Mahes’a, Indra and other Devas are all under the sway of this Time; so Time is the Sovereign of all. Therefore, O King! Wait for this Time. Now Time is favourable to the Gods and inimical to you. Therefore Time is destroying now the Daityas. But the course of Time is not the same throughout. O King! The actions of Time are various no doubt. Time creates men and Time destroys them. The time of creation is different from the time of destruction, this is evident to you before your eyes. See! When Time was favourable to you, you subject Indra and all other Devas and made them pay taxes to you; and now Time is unfavourable to you; so an ordinary weak woman is killing the powerful Dânavas; Time, therefore, is doing favourable things and also unfavourable things. The host of Devas or the woman Kâlî is not the cause thereof. O King! The present Time is not favourable to you and the Daityas; knowing this, do as you like. See! Indra, Visnu, Varuna, Yama and other prominent Devas all fled before in battle, quitting the weapons. So, knowing this world as subject to the control of Time, you can now fly away and go quickly to the Pâtâla. For if you live, you will get in future all the pleasures; and if you be killed, your enemies will all be very glad and roam everywhere fearlessly, singing propitious songs.

https://www.sacred-texts.com/hin/db/bk05ch30.htm

Vyâsa said :-- O King! S’umbha, the Lord of the Daityas, hearing the words of the soldiers, began to say, then, with eyes rolling with anger.

 S’umbha said :-- “O Fools! What are you saying all this? How can I do this unspeakably mean act and then hope to live? How shall I be able to roam in this world when I have become the cause the slaying of my brothers and ministers? Time is the more powerful cause of all that takes place, good or bad; so when this formless Time is the Supreme Ruler, what use is there in my brooding over the result? Let whatever come that is inevitable, let whatever be done that is destined to take place; death or life, I do not think of either. The more so when Time is never able, even when worshipped, to thwart off death or life when their proper moment arrives. See! The God of rain gives us rain in the rainy season; but, it is seen that sometimes it does not rain in the month of S’râvan (the rainy season); whereas it rains sometimes in the month Agrahâyana, Pausa, Mâgha, or Phâlguna (not the rainy season). Therefore it is evident that Time is not the chief factor. Fate is stronger than Time; Time is merely the instrumental cause. It is this Fate that has created all this universe; it cannot be rendered otherwise. I consider Fate Supreme; Fie on this one’s own exertion! For, Lo! Nis’umbha, who had before conquered all the Devas, is slain today by an ordinary woman! Alas! When Raktabîja, too, had been slain, how can I desire to hold on to my life, foregoing all my 

1. name and 
2. fame 

Even 

1. Brahmâ, who has created all this universe, will not sooner come to an end than his longevity expires. Four thousand Yugas constitute one day of Brahmâ; and in that one day fourteen Indras perished; 
2. so twice the life of Brahmâ constitute the life of Visnu; 
3. similarly twice the life period of Visnu constitute the life period of Mahes’a; and when their longevities expire, they come to an end. 

This visible earth, mountains, sun and moon all will perish; so it has been specially ordained by the Destiny; therefore, O Fools! I do not care a bit for the death. When a being is born, he must die; and when anyone dies, he will be born again, there is no doubt in this. So one ought to preserve one’s name and fame which is more permanent in this transitory body. Prepare my chariot; I will go today to the battlefield; let victory or defeat come what it may, as Fate has ordained. I will soon go to fight.”

https://www.sacred-texts.com/hin/db/bk05ch31.htm