Little Cub Killing Intent

This happened many times before only some of the impurities remained and Seth couldn't touch them. He forced aura into the blood and filled it, then he got hold of some and removed them.

Still, it wasn't enough. Seth turned off his Aura sight to rest a bit but what he saw surprised him. He was doing it all wrong. 

What he now held was a glowing red ball. It was eye-catching and red. Not only that, the red light basks the surroundings in red.

He looked down, there was a lot of grey matter scattered around. They looked like burnt bones that were brittle and easy to shatter. What he was holding was almost 45% pure aura and red.

Is it enough, Seth thought that if he kept removing the impurities he might overdo it. Because he was feeling the aura of blood more than ever as if it was his aura, and he could condense it to solid, perhaps?

He doesn't also want to continue because it may seem that the Aura and Red were becoming one. Wouldn't that taint the aura?