Only when there is no way forward but to fight will disciples of the Blood Skull sect attack each other. This will ensure that weak prey beings won't take advantage of the two predators after they fight and injure each other.
So the disciples of the Blood Skull sect that saw them left them alone. As for the disciples of other sects, they left Arthur and Thor alone because they were afraid.
No amount of beast carcass would make them decide to fight disciples of the Blood Skull sect. Especially when one of the beast carcass belongs to a suspected rank 3 beast.
In fact, many of them ran away as soon as they spotted their identity. They ran away because they could be next on the chopping block after Arthur and Thor were done dealing with the beast carcasses.
But there were some people who were not afraid of them or were afraid but wanted to dispel their fear by being brave. Their bravely was further encouraged by the absence of the corpse of the rank 3 beast.
