They re-opened it so no one else would, and so they could re-close it BEFORE THE ELECTION.
Normally an investigation takes a little longer than that.
If another agent got involved... then who knows what happens?
We ALREADY know Strzok edited the draft exonerating hilLIARy before their investigation was complete.
This is just spin before the memo comes out- kind of like “see? he was not biased toward clinton”
He opened it, so he could immediately close it, if anything.
In the crucial 72 hour news-cycle before the election Comey "cleared" Clinton, in a second whitewash.