Here's the only plausible explanation: The runners heading out for the run portion are supposed to be on the right side of the roadway and the run finishers are coming in, closer to the crowd, on the left side of the roadway.
The mom is heading out on her run, when, upon seeing her family, children and friends, she excitedly cuts across the roadway to get and give some lovin’. Mr. Hardcore tri-hack-lete is fully committed to the finish, using up the last bits of his glycogen reserves when all of a sudden - something doesn’t seem quite right. There is a lady up ahead acting all crazy. He tries to ignore the situation and assumes that there is no way that she will move into oncoming traffic so he keeps charging. Of course, as per their natures, the female is completely oblivious that there is anyone else in the world except her family and friends at that moment and crosses over the double yellow line, bam, they make contact. The male needs to get to the finish and tries to keep from getting taken out and the female is immediately a victim and has been terribly wronged, ergo, the tears and comforting words from a medical professional.
So yes they are both to blame but society will not judge the mom’s actions negatively, because, well, we all know why and we wouldn’t want it any other way. So let’s do the right thing here and pile on the male tri-geek.
BTW – does anyone know the guy's overall? Because if it's not very fast we can have additional fun at his expense.