Guys listen 2 me. IM A GTA MASTER MIND. hERES WHAT REALLY HAPPEN!!!!! Lance was in a helicopter with the deal. Lance saw tommy with his two buisness partners. He wanted to see If tommy was responsible with the murder of his brother. Lance used tommy to see if he really planed the ambush. But!!! Why did tommy ran away?? Now Lance totaly forgot that he had a boss. Sonny payed lance to leave tommys side. So he neverd found tommy a real friend. When lance wanted to kill the person that killed his brother, he played along with tommy if he was going to confess. So then Lance realized he wasn't involved. So he just used tommy until the very end.