Seth got tired of waiting for a response from Mina and decided to just live with his doubts of her and Mason for the time being. Instead Seth walked outside to get away from the group so he could relax, he hated large gatherings of people who were always talking but in this situation it was best to stick in large groups for greater fighting potential. Looking out at the scenery of Hell Seth's mind went back to when he was alive he hated his life but in hindsight it was so much simpler, all he had to do was kill whatever group was causing trouble, get paid and then rinse repeat. But, eventually Seth's mind turned back to that day, the day he died along with the rest of his group. The mission was simple, ambush a small work station of some smugglers, It should of been simple. Like every mission Seth had worked out different probabilities and scenarios to ensure success but he had made a miscalculation, he did not expect it to be a trap. So from his sniping point Seth could only watch as his team were slaughtered and eventually Seth himself was executed. 
Remembering the last part almost made him sick but he held it down as his mind drifted away from his death and back onto the scenery of Hell.