Looking at the comments on the board "They played the riff for 2 minutes and solo'ed over it" It sounds to me more like they were just playing something, and someone who posted it on that message board thought it was Break Free.
In the same way things like "Queen played One Vision in the soundcheck" get into the world. While all what Roger was was drumming a simple pattern.
I downloaded the concert from Penetration_Guru - Thanks!.....
Actually was a great show!
But just took out the (riff) Knights of Cydonia from the download for everyone to have there own comments...... link