You drop in skull town with 9 other players. The moment you shoot a guy or he shoots you, the other guys vanish from both your sights, like Wraiths jumping into the void or Mirages using their ultimates. From that moment you can continue fighting with the other guy until one of you dies or escapes as detailed in the original post, without getting shot in the back by opportunists. If you pick up an item from the ground during the fight, you and the other guy will not be seeing it on the ground anymore, but the other 8 guys that dropped in the same area will still be able see it to pick it up. It's just a matter of duplicating the item in this alternate dimension. The alternative version is for the other 8 guys outside the fight to see ghosts of you and your opponent when they are really close to your location (5-10m range), so that they can understand why an item on the ground disappears or a crate opens. This can work until the last fight or could become unavailable when there are only 5 players remaining or after round 4-5 when the circle gets really small. Ring damage would be the same in every dimension, so you wouldn't be able to exploit the alternate dimension.
The ability to phase yourself and someone else for a temporary period sounds more like a revamped wraith ultimate to me to be honest.
And one that would be true to Wraith's classification as an attacker.
