Alright so i don't know if this has ever been mentioned but i noticed that when atheon teleports 3 players it will show them on your radar. If you're looking at atheon mars will behind you and to your left and venus will be in front and to the right. Comes in handy if they don't announce where they're at or you didn't hear just to get the portal open quicker.
Hope it helps.
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Yep I hate when people ask me what side I'm on haha..... Like look at the Facking map I'm busy killing this praetorian