Too focused on the conversation between the dragon and Cat, Xavio didn't even take notice to the raven approaching when he heard it whisper-"Go back to bed fool,... don't you know anything about dragons? This one is a Copper dragon. The only thing that can get bad in this situation is if he tells a horrible joke. Or you can blast it with a lightning bolt and kill us all in the process."

First of all Xavio was only planning to hit the dragon if he showed signs of starting an attack. He was hoping to get a shot at its eyes...
In any case the bird was right. There was a very slim chance that he might hit the dragon straight in the eye and even then their safety was not guaranteed. 

Turning to the bird he said:"Calm your feathers, I wasn't planning to hit him without a strong sign of HIM starting an attack first. And I believe your master is awake? If not, you better hurry over to her."

So Xavio dispelled the faint electricity coming from his hands and started playing possum while at the same time keeping a close ear to the conversation.