Indeed, the explosion of the sphere catches his attention, completely unaware of an invisible Saurex closing in for the attack... until he feels a cut to the leg that gives him an abrupt and violent spike of headache, making him drop two of the morning stars and almost collapse on the ground.
"F-fuck ! What the- !?"
It's almost like his brain gets impaled by thousands of needles all at once, the pain unimaginable and unspeakable, completely catching him off-guard. He trembles, his breathing funny.
Struggling to regain his composure after the sneak attack, he picks up the weapons backh, then looks at the cut on his leg earlier... aside the pretty bad bleeding there, something about it looks off. It's hard to tell, but he feels as if it has something to do with dark magic, necromancy, or the likes.
Whatever it is, it's not good... and he definitely doesn't want to leave the injury there not treated.
But it needs to stay on the defense too.
There is a surge of occult, eldritch/cosmic energy in the air from the creature, followed by a faint barrier of sunlight, moonlight, starlight, and gravity force surrounding it ; there are fiery aura, frost mists and electrical sparks on the outside of the barrier. At the same time, a ray of light shines down and heals the creature's soul and mind back up from the severe damage earlier.
There is also what looks like dark matter, pitch-black and tar-like, leaking out of his skin and covering his leg like some kind of slime/goop. It seems to covers and heals up the injury from the sword strike.
Then he casts down aurora waves into the area, which would reveal sentient beings with a soul (or at least, subconscious, to an extent), regardless of their invisibility. It needs to see if it's being attacked from afar, or up close... and thus, Saurex is revealed with his outlines glowing.
"There you are !"
The creature appears to have his back facing Saurex ; he goes for a heavy kick with his back legs straight at Saurex. If the kick lands, the full force might be enough to smash a car door apart and literally knock the whole car to a side.