What the second example means is that your student pulled the quote from the web without checking the original. Did the student provide a citation? If it was to the original, that's truly bad scholarly form.

What annoys me is quotations which, when I check the citation footnote, are said to be quoted from some other secondary source, without further info. Yes, but where did it come from originally? The manuals I use say that when you quote a quotation, which you do because you have no access to the original, you cite it as coming from the original source and then add "as quoted in" or words to that effect, followed by your source.