There was some speculation as to how WWE snuck Sting into the building and put him on top of a box (that was supposed to be Seth Rollins’ statue) on Monday night for the final segment of RAW with Seth Rollins.
Sting was put in the box by WWE crew members during a commercial break prior to the segment. He was seen (by fans in attendance) wearing a hoodie to attempt to cover up his identity and, therefore, is why he some of his face paint rubbed off.
As noted, Sting will face Rollins at the Night of Champions PPV event for the WWE World Heavyweight Championship.