Oops, my last post is wrong - ignore it. 4, 5, 6 is the second row or column of the matrix, as you intended it to be. But if you want a ''facing'' or ''look at'' vector, you should still try 8, 9, 10. That is, assuming z is the forward axis in your world space.
You might also try 2, 6, 10, just in case you have something transposed.