You misread. Esper put everything he had into the blast, including his memories. Thus, he gave himself amnesia. Merin must be a real badass to have survived that. :D So, Esper has no idea what is going on, who he is, or what he's doing. The only things he has left at the moment are his calling to Thomas, his battling abilities (though how he got that strong he won't understand), and his empathy. And I just got an idea how Merin can take advantage of this situation, one I'm sure is not lost on you. But that's why I called him espeon in my last post. :P