No amount of cursing was useful, but Gao Yang couldn't release the anger in his heart without cursing.
Once the decision to fight was made, there was no choice but to fight to the end.
The downside of being sentimental is that even after killing the enemy, it would still be hard on oneself. Gao Yang had no other choice; if it were another situation, he would rather choose mission failure than fight to the death with Angel. But this time, he couldn't; Satan's entire fortune and life were staked on it. If Angel doesn't die, then they really will.
Satan's predicament was not in the present, but in the future.
Satan's alliance with Grand Ivan—that Djo might not know yet—but with this fight, especially since Nate was shouting, Satan's involvement became clear.
