In an earlier episode, Coraline gives Mick some stuff to turn him back into being a human. Then in friday night's episode, Beth & the new DA Talbot fall into the clutches of a bad vampire and Mick asks Joseph to turn him back to being a vampire again so he can save them. Didn't you kind of hate to see that happen to him? He was having such a great time being human, going to the beach, eating & drinking again. I thought it was sad that he had to change back.

Mick being turned back into a vampire.
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Mick & Joseph right after he turns him back.
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Beth & Mick on the beach while he was human.
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Sad, yes; but I knew that it was inevitable sooner or later.

^ Yeah, I suppose it wouldn't work to have your main vampire character stay human, would it?