Major Leagues

I've spent the last 18 hours on a knife edge. Filling in.
Called up from the late-career minor leagues.
When a co-worker had a family emergency, I have been filling in in a role I've not been in for a while.  In a room that is huge. For a client that has extremely high standards for their shows.

With no warning.

The phone rings.
My audio guy says "My dad is going to be dead by morning..." and he is obviously hyperventilating.
I grab a bottle of water and begin walking from backstage to where he is sitting.  I realize this is it...  I'm walking the green mile. This is a one way walk. I'm the only other guy in this town that knows the audio for this show. I'm going to be taking his place.
I stand with him for a minute, he gives me 2 minutes of briefing on how he has set up the system.  Then they grab him by the arm, put him in a cab and take him to the airport.  You see, we're a 5 hour flight from where he had to be. 
I used to frequently do gigs like this, but this client has risen our work standards to a level that is above me.  I spend more time managing than running shows. The guy who I have as our audio guy is very good.  Top notch. Today I'm a substandard tech-  luckily he spent 3 weeks designing a good system for this space. luckily he had time to get it running and tweaked out.  Because I have no freaking idea how to do it or where to start something this size.
I've been that A-list guy-  in a world that has now turned into a mural in the museum of production. I've had my moments.
Now I'm the epitome of 'jack of all trades, master of none' I know a stupid amount of stuff about a stupid amount of stuff. but can't put it together.
It's like knowing where all the pieces of the 3000 piece puzzle are located, what they are, what to do with them.  But being unable to put together more than a few pieces before losing focus.

But for one day, I got to play like a big boy again.