Time.
Time is everything. It allows you to understand what happened to you, and why.

In a minute, two, three. She understood.
She understood more with each minute than the minute before.
They were separated because it was too dangerous for him to stay. She was protecting him, she was doing the right thing. Or at least, she was trying to convince herself that it was the right thing to do.

Time. She thinks about all these years they spent together ; All of these things they accomplished.
And she felt pride in her sadness.
They were finally together, but he had to go and leave her behind.
And in a minute he was gone.