Tzeentch stood shocked. He understood the devil, demons were predictable. But this angel came from nowhere. He felt enraged that an angel would feel the ability to step forth. Granted he did save his life, but who was to say Tzeentch couldn't deal with the demon himself?! He withdrew from his fighting stance and drew back his sword. This angel wanted to fight the demon so badly, now was his chance.
"No one summoned you here angel. I neither know your side and purpose. You traverse my realm, defile my home with your footsteps, and attempt to 'assist' me?" He paused and gazed at Asomodeous, "Do not think I have forgotten you demon. I warned you not to cross me." He stepped back and into the water. Slowly but surly that water began to wrap around his ankles and up his shins till it reached his knees. It was as though arms had risen from the river to suck him down. But they did not. Instead the current of the river grew strong and the splashes of water hitting the rocks were great. " I will await until one of you falls before I challenge the one of you. Do not think that because you are a leader of a vast army" he addressed Asomodeous, "or that you are God's elite" now addressing Vash, "you do not carry equal strengths on this plane. And your weaknesses are heightened. Remember that, because I take no penalties here. This is my heaven, my hell!"
With that the clear starry night sky began to get cloudy with gusts of wind blowing and bending the trees. The current became stronger and the splashes even higher as this battle royal was about to commence.