It looks to me like the black car (#17) in front checked up pretty hard in the corner - the yellow car (#7?) closed on him real quick. Also - I watched it a whole bunch of times - it looks like the wheels of the #7 are locked at the point of impact, suggesting he was hard on the brakes. The #7 also took the low line on the previous lap through 3 and 4 so it's not like he was going somewhere he hadn't been before. Racing accident. That's how I see it.
-A fan
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