Let it fall. Grabbing at it could lead to an unintended trigger pull with obvious problems ensuing.
Make an extra trip rather than fumbling around.
I've never dropped a gun, but I did once find my cat sitting happily on my bedside table in the sun with his paw and head resting on my Ruger SP101, and the bbl sticking out over open air. When I walked toward him to remove him and ensure the gun did not fall, he of course stood up, and it fell. For an instant I thought I could catch it, but then I caught myself, and let it drop. Put a divot in the floor, but the gun was fine. Thanks Ruger.
I titled that thread "My cat almost shot himself."
This is also part of why I have taken to carrying polymer, common guns like my .45 XDs, rather than my revolvers that I have semi-customized and hand polished. Those are for woods carry, when I am not likely to be carrying groceries or getting in and out of a vehicle a lot. An EDC gun can get bashed up.