Ok, I was in the mezzanine tonight. It was my 5th time at the show. Here's how I interpreted what went down:
Killing Spree started. All was well as the ensemble entered. Then instead of saying, "Hey pretty girl, do you wanna dance?" as the first line, Walker said "Hey pretty sailor -" The crowd went wild, and Walker stopped singing. He then could not catch up with the song, because:
All the music and sound effects were a linked track, and could not be stopped or played back. They had no choice but to continue dancing, and since it's just a beat, Walker didn't know where he was in the song. Sound effects of kills happened, but no kills actually did.
Walker tried from the get-go to do everything he could to fix it. First, he said, "You **** it up for a joke, but here we go!" He then thought he could begin, and he didn't. The beat changed, and he again didn't know what to do. He stood Center Stage, and said into the mic, "That's live theatre!"
This CONTINUED on for another 60 seconds. Finally, Walker signaled to the band to stop playing, but running his hands in front of his neck. The band conductor said "We can't stop!" And Walker continued to stand there. Louis and Evelyn came in to do their mini scenes with Walker, but their mics were not on the entire time.
FINALLY, the music stopped completely. (If you listen to the LCR, this at 2:54 in the song. The conductor yelled "GO!" And Walker continued with, "Oh this is rich, I shouldn't say..."
The song then finished without a hitch. The light cues and projections never failed, either, which I thought was incredible. Great job on the stage management.
It was disappointing though that they couldn't or didn't stop when it all began, like Walker wanted, to re start the song. Many people were there for the first time tonight, and while I was satisfied to see such an exciting moment in theatre history, the Killing Spree sequence is truly the best in the show.
So yeah, it happened. The audience applause at the end was rapturous. Class acts all around, no doubt. Cannot believe they didn't hold the show.