Hi again, not sure where to post this, as it's probably just a "clever use of game mechanics", but I'm sure Blizzard didn't intend to make this spot.
What it simply is; A spot in both starting rooms (actually 2 spots in each room) where you can LoS unless the enemy comes; A) right next to you (obviously), B) at the furthest corner at the door (very few people can hit this spot, so I wouldn't worry about it)
It's a perfect spot for all druid teams, as you can travel from one to another and drink/catform stealth.
It's a decent spot for every one else who has to drink or reset a Arena game, and trust me it is ****ing annoying to run after someone who is drinking in there, only to find out you have to go on top of him to actually stop it
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