I think you are talking about Eragon, yes? (That is a series I have not fully read myself, on that note, so no spoilers are possible from myself =p).
I liked it; simple but decent and not a bad summary of the two as well. On the crit side of things, I feel it could be slightly improved by showing a touch more than telling (e.g. 'Each are immortal,/Neither of them dies.' seems to state the obvious a touch too much with the latter of those lines). The fact you said it was free verse did not seem too clear idea given the first verse had Blade/forbade and the next flies/dies, only with different lines rhyming with each other (unlike the first and fourth/fifth verses the second had 1st/4th lines rhyming rather than 2nd/4th which seems inconsistent, and the third verse had none). In other words, there seemed to be a rhyming scheme even if it wasn't intended and so it not quite been followed through felt just a bit odd. Probably a bit nitpicky but it came to my mind at any rate.
The fourth verse sounded a bit off as well, not in wording but the content itself:
But do not think them weak,
As they are both strong.
It seems out of place to warn readers not to think them weak as nothing beforehand has suggested they are weak. After all a dragon and rider who are immortal sound quite the opposite as it is. I'd suggest rethinking that bit or adding in something before that shows us their flaws which would give support to that verse.
Not bad all in all though; I liked it. Hopefully my thoughts are of benefit.
Well then let me warn critics. It says Samurai for a reason. I dont take critisism well.
That's not a really cool thing to say, even as a joke. If you post stuff on the internet, you should expect to get comments on your work, which may not always be positive. And after all, constructive critism is designed to help give you advice on how to improve, not to belittle you or anything. Saying 'Ill bash your head' because someone offered advice is not funny nor likely to encourage people to post replies to your work.
It was a joke. Im not in the mood to bash people through floors. =P But really, that was sort of a work-in-progress. I have written many great poems, and intend to write more. And BTW I was tired when I posted that.