they got away from it the same as a volleyball team getting away from a long serve.
The Dolphins didn't seem to know the rules at all. I still don't know all the rules. The ball ending up on the 10 yard line for first and goal seems insane. The Dolphins choosing a kick that could and probably should have been signaled for a fair catch also seems insane. What would be the point of even trying the kind of kick they did? Had it landed where they wanted the Titans would have just called for a fair catch.
Anyway, what I do now know of the new onside kick rules seems completely crazy.