Cryptocode: Orakel richtig platzieren

\documentclass[a4paper]{article}
\usepackage{mathtools}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{cryptocode}
\newcommand{\gen}{\text{Gen}}

\begin{document}

        \begin{bbrenv}{A}
            \begin{bbrbox}[name=$\mathcal{C}_\text{PRF}$]
                \pseudocode{%
                    K \leftarrow \gen(1^n)\\
                    b \xleftarrow{r} \{0,1\}\\
                    \text{Wenn } b = 0\\
                    \quad \vartheta_0 = F_K(\cdot)\\
                    \text{Wenn } b = 0\\
                    \quad \vartheta_1 = f(\cdot)\\
                    \text{Wenn } b' = b\\
                    \quad \text{return } 1\\
                    \text{Wenn } b' \neq b\\
                    \quad \text{return } 1\\
                }
            \end{bbrbox}
            \begin{bbroracle}{OraA}
                \begin{bbrbox}[name=$\vartheta_b(\cdot)$]
                \end{bbrbox}
            \end{bbroracle}
            \begin{bbroracle}{OraB}
                \begin{bbrbox}
                    \pseudocode{
                        x = 0 \quad b\\
                        x = 1 \quad a+b \rightarrow b\\
                        x = 2 \quad 2a+b\\
                        \text{Wenn } b' = 0\\
                        \text{Ansonsten } b' = 1\\
                        \text{Ausgabe } b'
                    }
            \end{bbrbox}
            \end{bbroracle}
            \bbroracleqryfrom{top=$x$}
            \bbroracleqryto{top={$y$}}
            \bbroracleqryfrom{top=$b'$}
        \end{bbrenv}

\end{document}