I wonder grammatically what "knowing that he must have..helplessly" is used to modify? Does "knowing that he must have..helplessly" modify "the thought of this" or "him" in "made him angry"?
(By the way, I'm not sure whether "modify" is appropriate for this question. Maybe "refer to" would be fine")
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Without more context, the words "knowing he must have kissed her as she lay there helplessly" are apparently appositive-like, meaning the same thing as "The thought of this." That is: "The thought of this, knowing he [Harold] must have kissed her as she lay there helplessly, made him [a different person, not Harold] angry."
fire1I wonder grammatically what "knowing that he must have..helplessly" is used to modify?
He knew (expressed as 'him'), so the participle clause (knowing ...) is associated with him. The relationship of the participle clause with the main clause is that of cause, so it's like this if you paraphrase it:
The thought ... made h