[Freedom4US]

That’s interesting, but I thought the first words were “OK, engine stop” (Buzz)

[Ezekiel]

Hmmm, this is an important point, so more accurately, better for me to state that Buzz's "413 is in" is spoken ahead of Neil's "Houston.." [but follows after "Shutdown"].

Interesting words in the numeric context/backdrop of the Book of Life, along with the 1201 and 1202 alarms (all considering, ???).

Armstrong: "Shutdown."
Aldrin: "...413 is in."
Armstrong: "Houston, Tranquility Base here. The Eagle has landed."

Neil, not over the air-to-ground loop, said "Shutdown" at the point of landing. Buzz was in the middle of a call to the ground that was "Mode control, both Auto. Descent engine command override - OFF. Engine arm - OFF. 413 is in." The last three words were after Neil's "Shutdown." And then Neil made the official symbolic statement "Houston, Tranquility Base here. The Eagle has landed."

413 referred to a software setting that configured the vehicle so that any abort would now be a ground abort and not an air abort.

http://www.jsc.nasa.gov/history/mission_trans/apollo11.htm

https://www.quora.com/What-were-Buzz-Aldrins-first-words-on-the-moon