I can attest to the fact that this 100% happened, and during one of my favorite appearances at SXSW 2014. The band is Power Trip, the show was Pitchfork's Show No Mercy event at Mohawk on March 11th, and the pain is real.
FYI.
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Watch This PBS Reporter Get Beat Down In A Mosh Pit During SXSW
"It appears Steve is having some technical difficulties"