You decide that you'll never truly be safe until you successfully end the Reanimators, and that means getting that weapon. If the Behemoth goes where you think he will, you should be able to get to the bionic weapon without even running into him.

You walk toward Subject Zero's cell, but in front of you, you hear heavy footsteps. The Behemoth has turned around and is now facing your direction. The door to Subject Zero's cell is close by, but Behemoth has already proven to be faster than you.