A light traveled horizontally at high speed beneath and through the lower part of nearby thunderstorm clouds.

A close friend (professional photographer) and I (retired peace officer) were on the balcony of a condo we had rented with our mates in Ocean City MD, while severe thunderstorms were coming a little further west towards the mainland. I was filming the sky from my Galaxy S22 with the hope of capturing beautiful flashes, while my friend was taking pictures with his professional camera for the same reasons. I took seven short videos spread over about 20 minutes, mainly observing the image on my mobile screen until the worst of the storm had passed.
Back inside the condo, I quickly reviewed the video footage, looking for finds that would have "dazzled" me, but from my very small screen, nothing too exciting, especially compared to the photos taken by my friend. But, watching the very end of my last video, I first thought I saw a tiny light moving quickly from north to south. I looked again and then showed this to my friend. I then transferred the video to my laptop which is old, and although the 13.5" screen was quite wider than that of my S22, its poor resolution did not allow to distinguish a constant or even solid shape. Neither one nor the other had noticed the stealthy passage of this phenomenum as no sound accompanied it. My friend's photos could not corroborate what had been recorded on my mobile since, unfortunately, he had already started putting away his equipment shortly before I set up for the last video. We were going to take a closer look once back home in Quebec.
On my 55-inch TV, the image quality makes it possible to better observe this white light which seems to touch the cloud base that must have been between 1000 and 1500 feet above sea level, according to us. It sometimes penetrates the clouds, then reappears further here and there. I cannot confirm how far it would have been visible in the sky, since I had ended my video before it reached the end of my field of vision to the south.
For our part, we ruled out the possibility of an airplane, given its high velocity which we estimated at about 2000 miles per hour, the absence of sound and the usual position lights, and also the fact of moving near severe thunderstorms while a tornado alert was in force. It would also be surprising if a meteorite would move horizontally at such a low altitude. Could it be a projector’s light? We didn't see anything like this during our week-long stay, and no rays seems apparent, but we can't exclude this possibility.
In the hope that the attached video can allow you to unravel this mystery.
Thank you!