al-Ghāfir

قَالَ الَّذِينَ اسْتَكْبَرُوا إِنَّا كُلٌّ فِيهَا إِنَّ اللَّهَ قَدْ حَكَمَ بَيْنَ الْعِبَادِ

وَقَالَ الَّذِينَ فِي النَّارِ لِخَزَنَةِ جَهَنَّمَ ادْعُوا رَبَّكُمْ يُخَفِّفْ عَنَّا يَوْماً مِنَ الْعَذَابِ

48. Those who were arrogant will say [in reply]: “We are all in this [Fire]! Indeed Allah has judged between [His] servants [justly]!”
49. And those in the Fire will say to the keepers of Hell: “Call upon your Lord to alleviate for us the torment for a day!”

No one will be able to carry the burden of others on the Day of Resurrection. How one who is the Fire save others from torment? According to the blessed Verses in question, the arrogant will say:

“We and you are in Hellfire and share the same fate and God judged between His servants with justice. Had we been able to render you help, we would have helped ourselves. We cannot do anything here.

We may neither ward off torment from you nor from us, nor are we able to take from you some of your torment. God never chastises anyone without any reason. Whoever has committed evil will be chastised accordingly.

Our burden of sins is heavier than yours since we were in error ourselves and sent you to error as well. Had we been able to do anything, we would have done something for ourselves. You have also committed sins for having followed us out of your free choice. You could believe in God as some you did and saved themselves from torment.”

When all of them lose their hope, they seek refuge in the angels of torment. Verse 49 is saying that when they become totally desperate, they turn to the keepers of Hell and angels of torment:

They know that there is no escape from Divine chastisement, but they merely request that Divine torment be alleviated form them for one day so that they may be able to take a rest and are content with the same.