Beamer: having grayed out items due to pause, but skipping over some

Question

I want to have 3 slides, where on the first slide, I have a list of bullet points, and then after the 2nd one, we KEEP the third one looking grayed out, jump to slide 2, where I talk about bullet point 2, and then after we go to slide 3, which is a duplicate of slide 1, but now nothing is grayed out.

Any suggestions?

Slide 1:

1. A \pause
2. B \pause
3. C \pause

Slide 2:

2. Means B is very good.

Slide 3:

1. A
2. B
3. C

Answer 1

\againframe is your friend. You need to provide a label to the first frame to be able to recall it later. And an overlay specification to tell beamer, which slides should be shown before going to the next frame.

Here I used overlay specifications for the items, because this makes it easier to see, which item is shown on which slide.

\documentclass{beamer}
\setbeamercovered{transparent=25}

\begin{document}
\begin{frame}<1-2>[label=list]{List}
\begin{itemize}
\item<1-> Point A
\item<2-> Point B
\item<3-> Point C
\end{itemize}
\end{frame}

\begin{frame}{Explaning Point B}
Stuff on point B
\end{frame}

\againframe<3>{list}
\end{document}

Edit: without \againframe you can only repeat the first frame. There just remove all overlay specifications. And the label for the first frame is no longer necessary.

\documentclass{beamer}
\setbeamercovered{transparent=25}

\begin{document}
\begin{frame}<1-2>{List}
\begin{itemize}
\item<1-> Point A
\item<2-> Point B
\item<3-> Point C
\end{itemize}
\end{frame}

\begin{frame}{Explaning Point B}
Stuff on point B
\end{frame}

\begin{frame}{List}
\begin{itemize}
\item Point A
\item Point B
\item Point C
\end{itemize}
\end{frame}
\end{document}