If present participle is used as an adjective in sentences like these

* *I saw him riding a bike*
* *The guy shouting at his wife looks familiar.*

Is it indicated the progress of an action or just describes a noun?

Basically, the sentences mean just the same as 

* *When I saw him he was riding a bike*
* *The guy is shouting at his wife and he looks familiar.*

but emphasizes on the facts (not progression) and a bit simplified for easier usage?