«وَلَمْ يَزَلْ يُحَمْلِقُ إِلَيَّ حَتَّى خِفْتُ أَنْ يَسْطُوَ عَلَيَّ»
He kept staring at me until I feared he might attack.
The anger then subsides: «خَبَتْ نَارُهُ وَتَوَارَى أُوَارُهُ» — his fire died down and its heat disappeared. Fire is a metaphor for anger, not a literal blaze.
Grammatically, lam yazal followed by an imperfect verb expresses continuation of a state.