Has Reed-Kellogg met its match?

Consider this beautiful sentence that I have just recently read:

He painted with such skill that words fall away, useless.

How in the world would I diagram "useless"?


Thank you.

I think you'd start by expanding the sentence to avoid ellipses:

"He painted with such skill that [the observer's/my] words fall away, [and are now] useless.

The actual diagram I don't have the tools to do.

Yes, I agree with that.

I should also point out that "such..that" is a corelative conjunction.