Here is the example sentence
“While I knew you were angry,” stammered the fellow, huffing along behind his beleaguered friend, “this was not what I had in mind.”
I figure that the "huffing along behind his beleaguered friend" is an adverb clause that hasn't been preceded by a subordinating conjunction, I feel that there is more. Is there a tense disagreement between 'stammered' and 'huffing'?
Am I correct in this?