Boy was that sky on fire! I'd be racing home too, those clouds have a ton of texture.
Were you trying to go for a pano with these 2 in particular? The best tools to have for a pano is
1. Your camera of course
2. A tripod
You want to keep the shot as level as possible throughout the panning. Make sure you maintain the same exposure and focal length for all the shots. As you pan, make sure that you've overlapped the previous shot by about 20% or 1/3 of the frame. Oh and do it portrait mode so that you can get as much sky and/or ground possible into the picture, that way if your pano isn't level you won't be cropping out important parts of the picture in order to make it straight.
I'm sure there are others here who are more experienced than me that can offer you some help as well.