User blog comment:Rolling rovers/Concerning the Nemetrix predators/@comment-8505655-20130504163429/@comment-8505655-20130506020641

The element of tools and weapons may play a role here. Intelligent beings can use these, so it stand to reason that some may depend on them, like humans. Ben tends to fight unarmed. Other aliens may be of the strictly fleeing variety, who survive by escaping rather than fighting, so they are not inclined to.

I think part of this is that Ben often does not know what to expect. Khyber's pet would rapidly transform and strike a blow before Ben knew what was coming. In a proper fight, I think the Omnitrix aliens might stand a better chance.