Translations for pierce in French

Here are paragraphs from public domain books translated:

And the adversary stopped. Of that they were certain. He was standing six steps away from the bed, motionless, undecided perhaps, seeking to pierce the darkness with his keen eyes.	Et l’ennemi s’arrêta. Cela, ils en furent certains. Il était debout, à cinq pas du lit, immobile, indécis peut-être, cherchant à percer l’ombre de son regard aigu.
The Confessions of Arsene Lupin, by Maurice Leblanc	Les Confidences d’Arsène Lupin, de Maurice Leblanc