Yes indeed RTFM. Also check again after firmware update, you may have got back in sport mode, or if you dropped altitude and crept up the hillside. In desperation the "choose a good spot to dump" is a decent strategy, I would have just attempted to land, rather than a CSC, but the outcome would have been the same.It is easy to suggest things sat at a keyboard, hard when up in the air drifting away and low battery.
Nice story, thanks.