Board Thread:The Flash discussions/@comment-13895380-20170427131354/@comment-24744701-20170504100329

I'm sure the Speed Force was trying to teach Barry a lesson, however, the speed force was also warning Barry to leave the moment he arrived (hence the Time Wraith). Since the scarlet speedster was pretty adamant about breaking Wally out and that the TW wasn't enough, they "willed" the Black Flash to intervene.