"along" in "the wolf passed something along to me"

Here is a quote by Jack Nicholson from the movie "Wolf":

Since it happened I feel as though the wolf passed something along to me.

I wonder why is along needed in that sentence? What difference does it make? How would the whole sentence sound without it?

When you say someone "passed something along", that normally means that there is a chain or line of "passing". Al passed it to Bob, then Bob passed it to Charlie, then Charlie passed it to Donna, etc. In that context you say, "he passed it along", i.e. along the chain.

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