Kawuk - Killer Lizard Cryptids?

The Kawuk is a reputed cryptid existing on a Southeast Asian island, where a maximum security prison is located. The kawuk has been described as looking like a very large monitor lizard, about the size of a medium-sized dog, with green or grey skin and a long thick tail. The difference between it and other monitors is that when the kawuk decides to jog or run, it rises up on two legs and holds it's shorter arms to it's sides. The back legs are said to be longer and more muscular than the arms, which can be used like hands.
Kawuks are said to hunt in packs, like wolves, and run their prey into a corner before they tear it to pieces with razor-like teeth and large claws.

Could the kawuk be a population of monitors who developed a culture of walking on two legs? Many animals have groups that form their own cultures and practicies, like the water tigers, or the elephant killing lions and the lion-eating chimpanzees. Could this be a similar case?
Or could the kawuk be a all new species of monitor? A return of large bipedal carnivores? A real life 'raptor' for the future of the Earth?

Shout out to FernandoooOOOo
https://www.youtube.com/watch?v=vunr9fQTjK0