The lake is wonderful, and he thinks it'd be a good place to camp, maybe later he could tell the other people.
Oh, wait, a man...
Hmm. The man looks like he still did not saw him, so the bearded man thinks that he will approach slowly, then sit by him, and say "how is the fishing?".
However he is not dumb, he kniws it could be dangerous. It's not the best weapon, but he grabs the pointiest rock he has and hides it in his hand, just in case.