Watching the High-angle replay of the finish at 50seconds on this video is probably better than the low angle right afterwards:
https://www.youtube.com/watch?v=LgWAGsLUF28
Initially, i would have agreed that the second place finisher was closing well enough that the two stride contact made a difference, but then i looked back at the whole finish sequence. When you do that, watch their lines...both women brush arms. Huddle reacts by drifting to her right and the second place finisher follows her over to the right rather than running the center line (shortest path). The final contact occurs after both drift left again, but wouldn't a reasonable conclusion be that two tired athletes were flailing at the end with a bunch of contact that was not intentional to impede but more reactionary to multiple arm brushes that seemed at times initiated by the second runner as well?
Kind of reminds me of that honolulu marathon story where the one guy rode the leader's elbow so tight the whole race and kept brushing his elbow just to try and distract...resulted in a punch if i am not mistaken.
So neither party looks innocent on this video, but selectively looking at the last four strides sure looks bad for huddle. Overall take is probably along the nascar philosophy - rubbing is racing.
But as to the term idiot, that is a bit harsh - moron might be a better IQ descriptor (50-70 for moron vs 0-25 for idiot). Your blistering judgement and suggested penalty for the arm contact is a bit much when you watch how the second place finisher responded to the initia arm contact at the beginning of finish video by getting closer to the runner rather than maintaining her line. Odds are more than a few elbows were traded on the entire half and huddle spreads both arms out at the end with a full torso lead on the high-angle camera.
But again this is a thread about the proper way to respond when someone breaks your record...way to fixate on the past of an event where two people were dead tired and sprinting schoolyard style, moron.