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\begin{logicproof}{1}
\forall x \; \big(P(x) \imp Q(x)\big) & prem.\\
\forall x \; P(x) & prem.\\
\begin{subproof}
\llap{$x_0\quad$} P(x_0) \imp Q(x_0) & $\forall \mathrm{e}$ 1 \\
P(x_0) & $\forall \mathrm{e}$ 2 \\
Q(x_0) & $\imp \mathrm{e}$ 3,4
\end{subproof}
\forall x \; Q(x) & $\forall \mathrm{i}$ 3-5
\end{logicproof}