Note: As the Church has said, the manual has been prepared as the primary source of lesson material. These supplements, from general conference addresses, are meant only as a complement to your study on this lesson’s topic.
Supplement is from President Henry B. Eyring's talk, "Man Down!" from the April 2009 general conference:
Almost all of us have seen a battlefield portrayed in a film or read the description in a story. Over the din of explosions and the shouts of soldiers, there comes a cry, “Man down!”
When that cry sounds, faithful fellow soldiers will move toward the sound. Another soldier or a medic will ignore danger and move to the injured comrade. And the man down will know that help will come. Whatever the risk, someone will run low or crawl to get there in time to protect and give aid. That is true in every band of men joined in a difficult and dangerous mission which they are determined to fulfill at any sacrifice. The histories of such groups are full of stories of those loyal men who were determined that no man would be left behind.