# Line is not centered between edges of nodes

I have this small tree and I want to draw a line between the edges from node A to node B.

\begin{tikzpicture}[scale=0.8, level distance=1.5cm,
every node/.style={draw, thick, rectangle, minimum width=2cm, minimum height=1cm, sibling distance=4cm, transform shape}]

\tikzset{edge from parent/.style={draw, edge from parent path={(\tikzparentnode) -- (\tikzchildnode)}}}

\Tree [ . \node (R){Crack password};
\node (B) {Acquire passwd file};
]

\path (R) -- coordinate[left] (PA) (A);
\path (R) -- coordinate[right] (PB) (B);

\draw (PA) to[bend right=25] (PB);

\end{tikzpicture}

As we can see in the picture the bend line is being offset to the right. And I have no idea why.

You can specify north and south when you draw the paths between the nodes.

## Code

\documentclass[margin=10pt]{standalone}
\usepackage{tikz-qtree}

\usetikzlibrary{shapes,arrows,positioning}

\begin{document}
\begin{tikzpicture}[scale=0.8, level distance=1.5cm,
every node/.style={draw, thick, rectangle, minimum width=2cm, minimum height=1cm, sibling distance=4cm, transform shape}]

\tikzset{edge from parent/.style={draw, edge from parent path={(\tikzparentnode) -- (\tikzchildnode)}}}

\Tree [ . \node (R){Crack password};