Did Metallica Prank Mexico City?

Weird goings on in Mexico City last night as Metallica brought an uber-production to town.  As you may have heard Lars and his drumset were crushed to death by a giant toilet.  Okay, I made that up.  I really made that up.  There is a giant toilet though.  More after the jump.

As you see in the 'fan filmed video below, all hell breaks loose during "Enter Sandman".  You'll see a man on fire, then the stage starts falling apart.  You'll then see a couple of guys on stage then another explosion of fire.  After that last little bit of drama, you'll hear James yell "stop, stop" and a couple people run out and put a couple of people on stretchers.  So was it all part of the act, or did Metallica's stunt go to far resulting in some real injuries?  You decide!