Not All Storms Die So Quickly
The battle was over and few of the Titans were left hanging around.  They had loved ones to tend to, and that was perfectly alright with Trigon.  He didn't need them getting in his way while he worked on dominating this world yet again.  He walked away from the masses of misplaced people and remaining Teen Titans, ready to leave.  Perhaps there was a small bit of Steve somewhere that wanted to see all of his friends one last time before leaving.