Elliot was elated as he could use his eyes to learn a foreign language and start communicating with aliens far faster than before and far faster than anyone else. No matter where he goes, he would always have the upper hand compared to the other members of his race. Communication was necessary to establish contacts. Talking in other's race language would also help in getting recognized by them. In the future, this passive skill would help him in various situations!
Elliot came here to learn the soul language, and he had done just that. He wanted to put it to the test now and see if he could decode the text on the elixir bottle or not. He couldn't leave because if he failed to, it would make his visit useless. Elliot needed to stay here. Otherwise, it would take a year before he would get to decide the recipe that would shape his and the future of humanity as a whole.