You guys overestimate pointed sticks.
Without shields, there will be much needless blood.
5 shields + 5 sticks > 10 sticks (yeah you could argue phalanx tactics, but that would miss the point)
In my opinion, shields technically evolved primarily because of wild beasts. (Second reason would be tribal missile harassment)
For practical purposes, it all comes down to psychology.
In such a small group without shields or even weapons, there would be a lot of sacrifice involved . Is it a clan/family? Or just some unlucky guys?
While the lion will kill easily with fangs and claws, the humans have to make well-coordinated mass attacks (without causing much substantial damage)to merely force pressure on the lion, who will flee at one point.
In an enclosed environment, humans without tools against a large predator are practically fucked.