Maybe they could just cycle announcers such as Shaxx, Holliday and Varix
Varik: Other Guardian has taken the lead...kill them dead!
or
Varik: Other guardian ahead...perhaps Varik choose wrong side?
Shaxx: Oh god your third, SECOND PLACE, FIRST! MAGNIFICENT!!!
etc. etc.
English
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Or, everybody gets their own announcer each race. That could be interesting. You hear cayde come over your headset and say "I've got a lot riding on this. Nothing of mine, but if you lose, Eris....Eris will be looking for her rock for a long time."
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LOL yes exactly! Some light humour such as the over-reaction of Shaxx when you multi-kill in crucible or Varik hedging his bets on who to call "Friend"