I reloaded the save a dozen or so times, and it would either stick around long enough for me to fire 300 or so arrows at it (and missing), or would fly away within a couple minutes. I even tried to TAI the dragon to freeze it in place. I fired some arrows at it... I adjusted my aim on dozens of arrows and it seems at certain ranges the arrows go right through the dragon rather than hitting it. I then used TCL and flew right up next to it, stuck an arrow in its side, then landed back on the ground and turned off TAI and TCL. Now the dragon was hostile, but instead of fighting me it flies away and goes after some mammoths again. Then it finally attacks my companion (Lydia), and suddenly just drops dead when it was almost full health. It didn't release a soul.
This is just a wee bit frustrating.