If the definition of plagiarism is beyond your limited comprehension.....
No, you provided an exact description of plagiarism by posting Registered's "Kamikaze" pictures without an intentional posting of their origin. Frankly, your lucky that Registered protects his stuff by putting his URL in the image itself. Had he not done that, you would have had no defense at all.
You're the one that had the unintentional, "dumb luck".
Why I bothered to try I'll never know.