Default [Q] M8 recorded lightning becomes few flicks of horizontal flashes?

Was on vacation in Asia, and there was a typical afternoon tropical thunder/lightning shower, so got under a shaded area and pick up on M8 (AT&T version) and started video recording. Luckily, I got a shot of another lightning+thunder, but when I playback the video, I realized the lightning has become just few flicks of horizontal flashes. I know didn't actually capture the lightning strike on the video, just the sky lights up really bright, but how come the M8 was not able to capture that? Not sure if it's a M8 thing or on other phones too.


Trying to past a youtube link but xda complains that I haven't reached 10 posts so no outside link allowed for me. Here is the youtube video#
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See between 40~45 seconds, you see few flicks of flashes, that's the lightning...