The dragon king spat on Pablo.
Why?
Because he was angry? Yes and no.
He was angry at Pablo but his anger would subside only after killing Pablo. Not by spitting on him. Yes, he felt good after spitting at him but that wasn't his goal.
He wanted to make Pablo angry.
The Angels were making sure the dragon king didn't walk free and they would only listen to Pablo.
So the dragon king thought that if he made Pablo angry then Pablo would order the Angels to leave the dragon king as he would want to punch the dragon king and fight one on one to quench his anger.
But that didn't happen.
Pablo simply wiped the spit of the dragon king from his face and showed no signs of anger on his face.
He knew what the dragon king wanted to do and Pablo shall not let the Being succeed.
He won't make the Angels let go of the dragon king and end the fight right here and now.
"These mind games won't work on me, El'Dorado. You already lost this fight."