Hallman was expected to face Thiago Tavares on September 1, 2012 at UFC 151. However, after UFC 151 was cancelled, Hallman/Tavares was rescheduled to take place on October 5, 2012 at UFC on FX 5. After the weigh-ins of UFC on FX 5 Hallman was 7 lbs. over the 156 lb. weight limit and Tavares said if Hallman could make 3 lbs. over the weight limit he would agree to fight him but Hallman could not and the bout was scrapped from the card. Hallman said he missed weight because of personal issues at home and both him and Tavares were paid their show money. Hallman was released from the UFC for missing weight twice in a row.