"Like a jann"—as if it were a serpent. "And turned back"—fleeing from it. "And did not look back"—meaning, he did not turn around; according to the tafsir (exegesis) of Mujahid.
﴿كَأَنَّهَا جَان﴾ كَأَنَّهَا حَيَّة ﴿ولى مُدبرا﴾ هَارِبا مِنْهَا ﴿وَلم يعقب﴾ أَيْ: يَرْجِعُ؛ فِي تَفْسِيرِ مُجَاهِدٍ