In this case, your sentence is perfectly fine without having a noun after "some" because it is automatically understood to be referring to people. In a case where something else could be assumed, then a noun would be necessary. Hope this helps!

In this case “people” is implied and it is totally understandable and correct. You can generally drop the noun to avoid repetition: There were some old cars in the old factory and some were badly damaged Or when it is implied (as in your example)

Some in your example means 'a group of people'. It is grammatically correct and it makes sense.

In your sentence, "some" can stand alone. It probably stands for "some people," but it could be more specific, depending on the context ("some doctors," "some of his friends," etc.). "Some" is a pronoun in this case, and it means "certain ones not specified or known [some agree]" (Webster's New World Dictionary).

It is perfectly fine sentence, with or without noun ( you can use some or some people)..