Thanks to Nick Noel and Wrestling Epicenter.Com for reporting the following:[Wrestling Epicenter.Com]:
In an update on the PPV "pyro" accident involving Undertaker last night at "Elimination Chamber", it's been reported that flames burned his jacket, causing him to immediately rip it off and move away from the pyro effect. When he got to the ring, Undertaker doused himself with water and worked the match as planned.
Apparently, WWE sources have indicated that when Undertaker returned backstage, he was extremely upset and was yelling about the situation as management tried to calm him down (the whole thing was merely an unfortunate accident).
[Please Note That Sites Outside Of Smash Wrestling May Contain Pop-Up Ads And That We At Smash Wrestling Are Not Responsible For Any Of The Content Seen On External Sites].
Source: http://www.wrestlingepicenter.com/11120110articles//268824901.shtml