It was not only the color guard, but the whole Corps.
I have witnessed this on a few occassions. One was when this older kid told his friends what he was going to do and he then ran past a Sop player, and then started laughing. The Sop player, without missing a step, went up to him and grabbed him by his shirt and pulled him back through the line. No words, No head turns from the rest of the Corps. They just kept marching. I am sure that guy still remembers this.
GABA