You think Comey re-opened a case, just to "get something dirty on Clinton?" Do you think he has put his neck on the line for nothing? Do you think he'd bring about a renewed investigation, to go against all of his superiors, as a political move? It's against the law for the FBI to interfere in a political campaign. This information goes back to her original investigation, independent from where we are now, before the election. This information must be so compelling that he needed to pursue further.
His career is over, either way.