[Otto hesitates for a second, then places a hand on Peter's arm.]

If I were to return to the exact same moment in time from which I was taken, the outcome would be the same. The reactor I built was already going out of control. It's for the best that it's drowned in the river, and since that's what needs to happen... I would need to drown with it. I've thought about it quite a bit over the months, but I can't see any other way out of that.