"Then when they perceived Our might," meaning they saw Our punishment, which refers to: before they were destroyed, "behold, they fled from it," meaning they ran away from the city,
﴿فَلَمَّا أحسوا بأسنا﴾ رَأَوْا عَذَابَنَا؛ يَعْنِي: قَبْلَ أَنْ يهْلكُوا ﴿إِذا هم مِنْهَا﴾ من الْقرْيَة ﴿يركضون﴾ يفرون،