It's based on the text from Philippians 2:4:
"Let each of you look not only to his own interests, but also to the interests of others."
To watch this wonderful sermon in action, click the link below (photo doesn't link):
Follow-up: after some googling, found out these little heroes' names:
#1 Cory Steadman and his supportive teammate, #2 Ricco ("Rocket") VanArragon.