וַיֵּט משֶׁה אֶת מַטֵּהוּ עַל הַשָּׁמַיִם וַה׳ נָתַן קֹלֹת וּבָרָד וַתִּהֲלַךְ אֵשׁ אָרְצָה וַיַּמְטֵר ה׳ בָּרָד עַל אֶרֶץ מִצְרָיִם׃ וַיְהִי בָרָד וְאֵשׁ מִתְלַקַּחַת בְּתוֹךְ הַבָּרָד כָּבֵד מְאֹד אֲשֶׁר לֹא הָיָה כָמֹהוּ בְּכָל אֶרֶץ מִצְרַיִם מֵאָז הָיְתָה לְגוֹי׃
Moshe tilted his stick at the sky, and God placed sounds and hail, and fire was sent groundward: God rained hail on the land of Egypt. There was hail, and fire flaming within the hail: very heavy, such that there hadn't been like it in all of the land of Egypt since when it had become a nation.
What does it mean that the fire was "flaming within the hail"? Specifically, was it flaming within each hailstone, or was it flaming within the hailstorm as a whole (so between the pieces of hail)?
(Rashi notes "a miracle within a miracle: the fire and the hail mixed, and the hail is water…", but I don't see that that is indicative of the one possible explanation I put forth above or the other. Nor do I see such indication elsewhere in my mikraos g'dolos.)