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i doubt riot will introduce this agent because swapping teammates as an ability is kinda stupid. there's going to be griefers and trolls playing that agent and swapping teammates randomly. Also there will probably be a heck ton of bugs with that ability and people will find exploits e.g somehow make a person teleport outside the map boundaries or something dumb like that.
Just wait a few weeks and they'll announce it.
The new agent is duelist with 3 flash, 1 rechargeable blind, and introducing new skill which make enemy get paranoia in linear.
The ult is to make all enemy blinded, flashed, and paranoia change every 1 sec for 5 sec.
Thus the agent codename is deadeye, which to make your eye dead.
Riot will never do ability like swap. Imagine someone swap their teammate's positions, there will be a lot of possibility for trolling , and ruiners. The same reason they disabled friendlyfire.
One week ago i had a game in which my teammate on astra was stunning me almost every round just for fun. Imagine what will happen with swap. At least people who's gonna be teleported have to get notification, location name, and press "agree button"