Responsa על בבא מציעא 73:5

Q. A says he is entitled to receive more than half of the interest due him and B from a Gentile, but B says he himself is entitled to an equal share with A.
A. Each one is entitled to receive the amount the other admits is coming to him; as to the remainder, it belongs to the one who will seize it first.
SOURCES: Am II, 155.