R'yak felt angry, he was angry with how these humans were so forgiving while they didn't seem to care how evil or genocidal the dark saiyans. all he wanted right now was to see their blood and he would not be satisfied until their blood was on his hands. no matter how much he tried to make something good out of the situation, every time the dark saiyan opened his mouth, R'yak wanted to kill him in the name of his dead family and take his vengeance, but through some miraculous restraint he kept himself from attempting to do such a thing. 

"These earthlings never understood what it is like to loose family, they're too greedy and selfish in their ways to really care" he said to himself. No wonder the saiyans found a home here, the humans may not have been as strong as the saiyans but their pride was almost as huge as the alien species. even when he tried to find some reason to care about the people of earth, he couldn't find one. he just wanted dark saiyan blood to avenge his people and see the race destroyed.

the anger he felt earlier when they fought the Devastator was what helped tap into his great power and his mind wandered back to the time when he had heard the elder of his race speak to him of the prophesy. the prophesy said that he would be a powerful warrior with a great amount of rage in his heart and he would become strong after he lost everything and knew what true pain felt like. he didn't really believe the elder's words but that appeared to have been a mistake and now his family was dead, and he was full rage and his powers had grown greatly. there was nothing in this universe that he wanted since his family was dead and his race almost extinct, all that mattered was killing the dark saiyans and he would keep his hate deep inside of him.