Where was Billy Long during the reading of the US Constitution in the House Chamber?

I was watching C-Span and the reps reading the US Constitution on the house chamber floor.

I saw Vicki Hartzler read her sentence, I heard a lot of reps read their sentences. I also saw a lot of empty seats which led me to post this tweet on twitter at around 11:20 AM:

Billy has constantly told us folks down here in MO 7 how important the constitution is to him and how he carries his rode hard and put away wet copy in his hip pocket.

So, when I didn't see him in the chambers during the reading, I thought he might be in the restroom, or maybe taking a break in the house lounge or perhaps in the house cafeteria getting a quick sugar fix or even in the lobby outside John Boehner's office trolling for reporters.

WRONG!

HE WASN'T EVEN IN THE BUILDING!Eight minutes later after my tweet, my Congressman, Bill Long, tweeted this: HE WASN'T EVEN IN THE BUILDING!

Ah jeez.

I just called Billy Long's office to express my disapproval that he wasn't even in the building during the reading of the constitution. The person I spoke to told that Billy had a previous appointment with Mr. Phelps. Billy's tweet makes it appear that Phelps just dropped in to see Billy.

What gives Congressman Long?