True, but for the sake of argument, wouldn't the fact that the gill filaments are bright red indicate that gas exchange is still occurring, albeit across a reduced surface area?
As long as the gills are wet, gas will exchange. Not to mention, The concentration of O2 in air is a lot higher as well.
30seconds is a lot of time out of water. Think about those fishing shows. It pains me to watch the host admire the fish and talk about it. Then you wonder how many takes it took. When I think back and count how long I've kept fish out for, it's not more than 5 seconds, if that. Get the camera set up, lift the fish, click click, back in the water.