As an engineer, the reason for the nose horn appears very obvious to me, and I am surprised that this has been overlooked. The teeth are narrow in profile and blade-like, therefore have very little structural integrity side to side. The skull below the horn is reinforced and there is only one reason for carrying this additional bone mass along with the horn. The additional energy expenditure required to carry it is exceeded by its return in energy. The horn is simply to increase the arc of the circumference of snout. Allowing the head to be used like a claw hammer, drawing the teeth through the flesh of the prey. This requires no energy to extract large portions as the weight of the ceratosourus is used to push the head forward allowing the snout to rotate the jaws and the cutting edge of the teeth through the arc against the side of the prey. The narrow profile of the horns would reduce side slippage; helping to protect the vulnerable teeth from lateral forces from still strugling prey that could snap them off.