Commentary
Mentioned in the first of the four verses cited above are disbelievers who had not participated in the battle of Badr, therefore, they survived or there were those of them who deserted the battlefield after showing up as participants and were thus able to save their lives. It is about these people that it was said in this verse that these people should not think that they have made their escape good because the battle of Badr was Divine punishment for disbelievers and escaping from its grip was not possible for anyone. Therefore, it was said: إِنَّهُمْ لَا يُعْجِزُونَ 'Surely, they will not frustrate [ the Divine will ] - 59'. It means that these people cannot outsmart the will and power of Allah by their cleverness. If He decides to seize them, they would be unable to move even one step. May be, they are seized right here in this mortal world, otherwise, their detention in the Hereafter is all too obvious.
This verse has given a clear indication that a sinner who finds himself delivered from some hardship or pain, yet he fails to repent and make amends, rather stands adamant and obstinate over his sin, then, one should never take this to be a sign of success and everlasting deliverance. In fact, such a person is in the grip of Allah Ta` ala all the time and this respite given to him is actually adding on to his punishment and distress - though, he may not realize it as such.