How do I defeat Vettenmyer?

Hint 1 of 19:

You have very little time before he comes in and overpowers you.

Hint 2 of 19:

It would help if you could stall a bit.

Hint 3 of 19:

But it would be just as nice if you went back in time.

Hint 4 of 19:

Have you read the sign in between the two platforms?

Hint 5 of 19:

Get on the right platform to travel back in time.

Hint 6 of 19:

Now, you'll have to go back to the future to stop Zeke.

Hint 7 of 19:

There is only one time when you can do anything, so experiment.

Hint 8 of 19:

Get on the left platform at 7:59 so you appear at 9:01.

Hint 9 of 19:

Vettenmyer has been knocked down, so you have a little breathing room.

Hint 10 of 19:

Don't try to stop Vettenmyer now.  Just stop his machine.

Hint 11 of 19:

Put the key in the keyhole and get out.

Hint 12 of 19:

Stand on the right platform.

Hint 13 of 19:

Now, you'll be strapped down.  You have to guess the right number.

Hint 14 of 19:

If you did things properly, the other you already gave you the number.

Hint 15 of 19:

So say that number to survive.