Who Attacked Roman Reigns at the End of WWE SmackDown?

Two nights ago, as WWE SmackDown Live was going off of the air supposedly with Roman Reigns issuing a challenge to another WWE Superstar for SummerSlam, he was mysteriously attacked!  Who could possibly have perpetrated such a heinous attack?!  Detectives The Rob and Jerry Valeri are on the case on today's episode of "Post 2 Post" in the video player below!