If we lure someone from another place of employment and that person doesn't work out, after 6 months or so, are we liable for anything because we lured that person from his or her previous place of employment?

Depending on whether the employee signed an employment agreement with you and what that agreement says, you may owe him enhanced severance because of the fact that you lured him from another company. It would also depend on how long he had worked at the other company. I propose that we discuss this since you will need to craft a severance offer that is appropriate, in the circumstances.
Lior Samfiru