Teaching him "Speak" has apparently backfired right at this moment, and he would not give up until I satisfied his need to play. He did eventually settle down after a game of toss with his football.
But, that didn't last long. He decided to settle in Onyx's favorite cardboard box and eat it.
I decided I needed to give him a time out in his crate to settle down for real. Soon, he curled up blissfully in his blankets for a much needed nap.
And Onyx got his box back.