So since Emily has been using X to try and make a cure the Infection. So much Holy energy has been built up inside him and since the infection hates Holy energy or something like that, halfway of him fighting a tough opponent he clutches his head and the Holy energy is too much to contain and it bursts out of him as giant wings that resemble Emily's since she's the only thing he can think of. His body also starts spewing out extremely hot Holy energy since it has nowhere to go and it's being mixed up with his flame energy.
This would all be technically possible because of his connection with Nova Energy and it not being taken away while he was infected
You see. Since X is a Xylone his body is constantly burning itself from the inside to try and rid of the virus. That's why he's in so much more pain than a lot of the others. He's like Shin Godzilla but opposite. Instead of a Mind that wants to die and a body that wants to live. His body is trying to kill itself while X is just trying to live long enough so a Savior can free him
