William Campbell was so engrossed as he walked that he didn't notice the situation around him, tripping when someone suddenly cut in front of him, his body completely unable to stop in time.
Seeing William about to fall, Elly Campbell didn't have time to think; since one foot was tied to William's, she could only turn sideways, using her body to protect him while trying to avoid bringing him down with her other foot.
However, as a result of trying to do so, she and William both ended up falling to the ground.
Because she protected him, William was not hurt from the fall, whereas she herself hit her knee hard on the ground, and when she fell, her hand scraped against the ground leaving a bloody mark, the pain causing her to unconsciously furrow her brow.
Meanwhile, the parent who tripped William seemed oblivious, continuing to lead her son towards the finish line.
Elly Campbell helped her son up, "Baby, let mommy see if there's any..."