He was making the sign repeatedly. So he was making an L shape with his thumb and forefinger of each hand and then touching the web between his thumb and forefinger of each hand repeatedly.In it's still form here, it doesn't mean anything.
That is me trying to imitate the guy who made the sign. And no, I do not know sign.Who is the person in the picture? Someone who doesn't know sign but is attempting to imitate what you think you saw?
Hmmmm, what would that be? Just kidding, I think the sign you are referring to is universal, even to an ignorant non-signer like myself. All of his fingers were fully extended and webs touching.I mean it is close to a sign I have in mind but in the still picture above, sure there's the L shape with the thumb and forefinger extended but also on both hands, all of the other fingers are extended as well.....if all of the extended fingers were clenched and you have both thumbs and forefingers pressed together to form, ahem, a sort of a triangle, then what do you think you have now?