Oh... OK. If it was attached already to that rock, then that would be a great way to transport it, as long as you had plenty of water to cover the coral... and then some. Torches, frogspawns, and that whole family are pretty easy to keep, but transporting them is the crux. Before you move it, you really want to get the tentacles to retract as much as you can. You want the tissue sucked up as tight against the skeleton as it can get. You also want to bag, unbag it underwater, if possible. If you can't do it underwater, then upside down is a good thing as it keeps the tissue off the sharp skeleton as much as possible. Out of water, it doesn't have any buoyant force to minimze its own weight, and the tissue can easily be cut by the skeleton.
Yeah... if it was the owner that bagged it, I guess I know how that conversation would go!