Nissan 350Z Coupe Crashes Into 350Z Roadster on the Highway, How Did that Occur?

Here's a video that will have you trying out YouTube's loop feature to find out what exactly occurred to cause this crash amongst two fellow Nissan drivers, which looks like it occurred either in the States (more most likely) or in Canada.
The dashboard footage from the Infiniti G35 that was following from behind shows the Nissan 350Z roadster on the left lane and the allegedly supercharged 350Z coupe on the right side driving at what seem to be standard speeds.
Then when hear one thing that

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