I actually think that Lucas Hellinger is a good person, even though he doesn't appear to be. Reasons I think this are because:
1. He un-cuffed Lloyd, even offered him a drink.
2. He warned Mark that he was going to die. If he really wanted Mark dead then why would he have bothered warning him? I think he maybe told Mark this because it was a way in which Mark could survive the attack on the building. If he hadn't have told Mark this then he would have died.
3. He also comforts Mark by telling him that his daughter will be safe and alright after this is over.