Points are awarded for kills and revives, and the first team to 200 points wins. Every player gets a random AR or DMR on drop, and then they just sort of shoot it out: if you die, you wind up right back on the plane, right above the action. The circle never changes, and serves more just to define an arena than to play any role in match progression.
Instead, there are three teams of ten that are fighting it out in a space the size of a late-game circle carved out of the larger map. Right there, things have become totally different: the 'one life to live' idea is pretty essential to a battle royale. Here's what changes: first off, you can respawn.