How did Vishnu repay Vali in Dwapara yuga?

When Srirama hit Vali with an arrow from behind a tree to kill him during Tretayuga, Vali questions Srirama's action. Srirama explains to Vali: "First of all, Sugreeva had surrendered to me and in turn, I had promised to protect him from you and make him the King of Kishkindha. If I had appeared in front of you now, you too would have surrendered to me and I would not have been able to keep the promise made to Sugreeva. Secondly, I have a mission to save this Earth from Ravana. If you would have killed, which you might not have succeeded in doing, my mission would have failed. Why you could not have killed Ravana is because you cannot forego the boons bestowed upon Ravana by Lord Brahma. Thirdly, I had to punish for banishing a sincere and honest brother and for living with his wife as it is amoral and illegal. Fourthly, you are a powerful Vanara and hunting animals from behind a tree is quite a common practice. However, if you still want, I will make you alive again. Choice is yours." Vali concedes and says: "I am quite happy to die at your hands Rama and if you make me alive now, I will not get another opportunity to get killed by you, the Lord. Please take proper care of Angada, my son."

In spite of this conversation, Lord Vishnu did not want to leave the matter there. Vali was the Amsha of Indra and he was again born during Dwapara as Arjuna. Lord Kirshna, an incarnation of Maha Vishnu, serves Arjuna as a charioteer, friend, philosopher (by preaching Geeta) and guide to him till the very end. That is the conviction which is beyond explanation. Lord is always gracious, kind, compassionate and considerate to his devotees. Om Sri VishnuvE Namaha.