It was nearly instinctual, or perhaps instinctual itself for the Orc to fasten his pace towards the cover of the cairn. The green light that had filled the realm before them had caused him to have immediately jump into action, not one who has dealt with the arcane too much, he still knew through experience that the sudden wailing of the... dead, and the strong green light was somewhat like that of a firefight on a planet. Chaos was something the Orc was used to being within, and the sight of skeletons and corpses rising before him did strike a good deal of fear within him, despite having seen much in his four years as a galactic mercenary, he had never seen the dead literally be raised from the earth to assail upon the living. 

It did take him aback, since he was raised by ancient traditions that the dead were sacred, and to be burnt via cremation to keep their remains from being desecrated. A brief thought filled his head regarding the situation as his combat boots dug themselves into the dead black sand, the Orc's pace breaking out into a full sprint towards the entrance of the obelisk. The gear he was handling at least weighed a dozen or so pounds, which slowed him down somewhat but he appeared to have donned enough weight in armor in his life to keep a decent pace within a combat scenario. This was much different he thought, the Orc came to realize this must have been also what it meant when his parents taught him of the tradition of cremation, and it didn't exactly fill him with rage, but a small degree of pity for the remains of those who had died. 

He also was motivated by the dead oddly enough, knowing that if he fastened his progress he would perhaps not end up among these... creatures that had been raised by some form of supernatural force he only heard tales of on this planet. The armored mage he saw bewildered him slightly as he saw the bolts of light clear the path for him, the young swordsman and the barbarian female warrior. He also cursed to himself on how he had only one shot within the primitive rifle he had, as he caught site of a green figure, a grotesque thing that was the remains of a dead human explorer much like the other ones he had seen. He raised his rifle and fired the heavy calibered rifle into the corpse of the undead, the powerful rifle causing the undead to fall back into the dead dust with a large hole in it's chest cavity. Coagulated blood splayed out across the ground, disgusting the young Orc as he'd go to set his bayonet and settle the long rifle into a tactical position. A loud roar escaped his mouth as he would be seen driving the bayonet situated on the end of the rifle into various undead, following up with a series of strikes and so forth as he booked it through the small pace Fionn had made for him and the others. He was determined to make it to the obelisk, and didn't care if the others he had saw had gotten there before him, only caring for survival at this point as his rifle's buttstock slammed through the living remains of a human skeleton.