I don't believe he did anything different than any other driver does during a caution. One of the things that amazed me the first time I did coursework at the St. Pete Grand Prix was that when there's a caution, the only cars running substantially slower are the cars that are immediately behind the pace car. For everyone else, it's an opportunity to close on the leaders. They have spotters on the track telling them what the issue is and where it is. They'll back down just enough in that section to give themselves a safety margin, but for the most part, it's racing as usual.

Telemetry had him running at 175 mph. IIRC, lap speeds at Homestead were around 215mph during the race. That's a 40mph margin which I suspect is about as much as any driver would back down unless bottlenecked behind a pace car. In this case, I suspect that his spotters told him what line to take and the other car rolled down the track faster or slower than expected and they wound up in the same place at the same time.