The two drivers were involved in on-track collisions at both Silverstone and Monza, with the former incident leaving Verstappen in need of hospital treatment. It was his British rival deemed at fault by the stewards, but he duly recovered from a 10-second penalty to take the chequered flag.
In Italy, both were unable to finish but this time it was the Dutchman held responsible, and he incurred a grid penalty for the following race in Sochi.
Horner, 48, and Wolff, 49, inevitably held differing views over the incidents, and the pair continued to snipe back-and-forth until more controversy at this month’s Brazil Grand Prix.
Verstappen appeared to deliberately run wide when defending an attempted overtake from Hamilton, and yet dubiously escaped punishment.
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“Hopefully in the regulations, with the consent of everybody that, first of all, the stewards need to have access to all relevant channels.”
Horner agreed, believing the FIA were at risk of setting a precedent which could result in multiple incidents having to be investigated.
“Well, I think that’s the danger for the FIA with this,” he said.
“If they do go down this route then every single incident from now on will be questioned. There’ll be evidence from iPhones or spectators’ phones.”