The role of angels in executing Allah's will

فَكَيْفَ إِذَا تَوَفَّتْهُمُ ٱلْمَلَـٰٓئِكَةُ يَضْرِبُونَ وُجُوهَهُمْ وَأَدْبَـٰرَهُمْ

Then how [will it be] when the angels take them in death, striking their faces and their backs?