Rohan has a feeling that Josuke is cheating at cee-lo, and cuts off his own pinky. If he is unable to figure out Josuke's trick in the next round, he says he will pay him 2 million yen to have him use Shining Diamond to fix his finger. But if Rohan does figure it out, he says he'll take Josuke's pinky instead. He even calls Tamami to act as a mediator, having him use his Stand ability so Josuke can't play fairly the next round, either.
It'll be a give-and-take in 
exchange for his nutrients.
إنّها مجرّد عمليّة تبادُل ما بين مكوّناتك ومكوّناته الغذائيّة
Eine Hand wäscht die andere. Ich werde
stattdessen seine Nährstoffe erhalten.
Ambos saldremos beneficiados,
me alimentaré de él en vez de ti.
Ambos saldremos beneficiados,
me alimentaré de él en vez de ti.
Je me nourrirai de lui,
c’est donnant-donnant.
Sarà un semplice dare e avere,
in cambio dei suoi nutrienti.
Ambos vamos sair ganhando,
porque vou pegar os nutrientes dele!