I was reading comments about balance in the crucible when Gambit crossed my mind. The idea of a pve centric event with an element of PvP thrown in is interesting...but what about the reverse. Imagine playing trials and half way through your game is invaded by Randal the Vandal or Urzok the hated from D1 Skywatch. The match would be turned on its head.
Imagine the tension of having a pissed Hive Knight chasing you with a cleaver while someone on the opposite team tries to snipe you.
Also:
[spoiler]Shameless self promotion:
https://www.bungie.net/en/Forum/Post/247267710/0/0[/spoiler]
Heck, even imagine knocking a Guardian off of the arena only for them to fall into a pit of thrall or Knights. Reminds me of the river filled with hungry crocodiles beneath a rope bridge from many of the older adventure movies.
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That would be hilarious