Let's rewind time to a few seconds. It happened after Alex felt that he couldn't dodge the dragon's next attack, not because he underestimated the latter but because the traps he laid beforehand didn't work as he didn't know he would spend more energy if he wanted to lock the other party space power and the result was he felt into a predicament, he was about to die while it was sure that he would be revived until he reached satisfactory result for some reason Alex was unwilling, therefore he summoned Ego, he let him die in his stead while he used this opportunity to escape.
[What a pity that this human is so weak and died so quickly I thought I would have a bit of fun fighting] The dragon lamented and the Slaughter King wanted to nod but his eyes widened, turning round after he noticed unexpected and it didn't take long to the dragon's to feel the unusualness.
''Who said I've died?"
A voice reached the dragon's ears and it quickly turned its head.
Finally here, I've planned for this since I've got the idea of Asura's bloodline.