The Undertaker has an elaborate entrance which includes flames shooting up from various parts of the stage. As he made his way on to the stage, one of the flames was fired off directly underneath him and he was momentarily engulfed in flames.
He quickly moved off that spot and threw down his jacket which caught on fire. The Wrestling Observer reported that The Undertaker suffered first- and second-degree burns on his chest and neck. Even that didn't slow him down as he went straight into the ring and wrestled for over 30 minutes.
On Tuesday, WWE spokesman Robert Zimmerman said that The Undertaker is doing fine and the accident was just a mistiming. "He threw his jacket down. It kind of singed is the best way to describe it," Zimmerman said.
Zimmerman said he suffered a chest injury that looked like a bad sunburn and was cleared to wrestle by a ringside physician. The WWE is investigating to determine how the mishap occurred.
Off camera, The Undertaker was given bottles of water throughout the match and he continued to douse himself. As you can imagine, he was quite upset afterward, but that is one tough guy.
Below is a video that a fan caught of the incident.