The author is emphasizing the greatness of the punishment for those who reject Christ. Alternate translation: "This was severe punishment. But the punishment will be even greater for anyone ... grace!" (See: [[rc://en/ta/man/translate/figs-rquestion]])
Someone who has disregarded Christ and scorned him is spoken of as if that person had walked on him. Alternate translation: "who has rejected the Son of God" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This can be stated in active form. Alternate translation: "the blood by which God sanctified him" (See: [[rc://en/ta/man/translate/figs-activepassive]])