1) Why do I see that its recommended to start single target DPS With Blizz 3 - Thun 2? I get the thunder but why don't you start with Thun 2 or Fire 3 first? I tried the above and it seemed slower to start ramping up.

2) How do you deal with when you start casting but a mob runs by you and now your not facing the correct way and the game doesn't auto correct you because you faced the mob already when you first started to cast?