Brutus is trying to get across that his actions were honorable, he's trying to explain that he was correct in killing Caesar. That only bad men, (content to by slaves and not true Romans) would be offended.
As soon as he'd briskly finished up all of his chores he had, he lit his fire and spied us in the blaze/the heart's inside us shook/terrified by his rumbling voice and monstrous hulk.
not my answer! one I had found. I don't want to take credit for this as I don't know what this is actually about. just wanted to help!