He is caught in his own snare.
More Latin Proverbs:
If it pleases you, it does not displease me.Latin
Let the buyer beware.
Latin
If I wrestle with a filthy thing, win or lose, I shall be defiled.
Latin
An evil comes from a neighbouring evil.
Latin
Figs he calls figs, a spade a spade. [Said of a man who speaks with sincerity and means what he says.]
Latin
Liberal enough of another man's leather.
Latin