Basically just like the rescue ranger but instead you shoot it at enemies and it swaps your position for the enemies and the enemies for you.
The meta would basically be to play close support, pick lone enemies and teleport them to your friends or sentry. Or you could jump off a cliff and swap places with an enemy.
I could imagine this being funny on high tower or maybe harvest.
Edit: thought of a name
Would be fun as a mod, but super overpowered. Imagine constantly swaping with their med. Infinite uber denial unless med hides all day