User blog comment:PoisonedSorrows/Helgan Dragon!/@comment-4787430-20120408041503

You have the option of asking Ralof/Hadvar "Was that Dragon on your side?" After escaping Helgen.

In a way he did save you from your execution, but I highly doubt he was on your side or anyone elses side...obviously.

I do tend to think that Alduin may have known that you were a Dragonborn...and that that was the reason he appeared at the execution.