It's too late to swim back. We're closer to the other side

Anton: "Where's the shore? We're too far out!"
Vincent: "You wanna quit?"
Anton: "We're too far out!"
Vincent: "You wanna quit?"
Anton: "No!"
...
Anton: "How are you doing this Vincent? How have you done any of this? We have to go back."
Vincent: "It's too late for that. We're closer to the other side."
Anton: "What other side? You wanna drown us both?"
Vincent: "You wanna know how I did it? This is how I did it Anton. I never saved anything for the swim back."