Daneel watched on carefully after teleporting the Emperor over, as he wanted to reverse his actions if there was even a hint that this meeting might cause any damage to his psyche.
He knew that the probability of that happening was minute as he had managed to survive for so long, but still, it was best to be careful.
As for the reason he was even doing this…it was the hope that the Queen might be able to heal him in the same way that he had healed Xuan.
He had a debt to the man which he couldn't even put into words, and he also deeply admired him because of everything he had done. Hence, he was ready to do anything to help him.