[SDC]

You may not have threaded the ejector-rod all the way back onto place, and it unscrewed under recoil, leaving it too long to unlatch from the frame. If you're SURE that it's unloaded, I would probably try to use some non-marring thin wedges or spikes (wood or plastic) to stop the rod from spinning, and then spin the cylinder in the proper direction to get the rod to screw back into the cylinder; you'll probably need to use a piece of tape across both the hand and the cylinder stop/bolt to get them out of the way while you're spinning the cylinder. Past that, your only option would be a gunsmith, who can probably do a better job to begin with.