كلمح البصر أو هو أقرب
Like a blink of an eye, or even nearer.
The same short phrase can evoke extraordinary speed in different situations. Its literary reuse need not interpret every aspect of the Quranic context; the new author may employ its recognizable verbal image for a different immediate purpose.
Do not confuse the source's subject with the new passage's purpose. They share the image of speed, not the same underlying event.