https://www.polygon.com/2019/2/22/18236495/destiny-2-gambit-new-update-season-of-the-drifter

In This Week at Bungie, Bungie’s regular blog update, the studio revealed new changes coming to Gambit with Destiny 2’s Season of the Drifter on March 5.

A third round tie-breaker will no longer occur when two teams go even in Gambit. Instead, the third round will be a “Primeval rush sudden death.” While not clear, Stevens declared this new change will speed up Gambit matches. It sounds like this final round will spawn in the Primeval at the start, letting players scramble to kill theirs first without having to go through the process of spawning it.