I'm still wondering who the hell this guy is, and why he seems to have much more power than he should.
He has done a lot of questioning and sticks his nose in everyones business. He questions Horace all the time. He questions the head of security (Sawyer) all the time. He had an itchy trigger finger with Sayid.
He's just an odd character that either has more power than we realize, or just thinks he has more power than he does.