Accused of 2boxing

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The Guides guide to catching a 2boxer.

Check their information.
Watch them for several minutes.
Move characters to different locations.
Make them move different ways and talk at the same time, etc.

Ban them if they fail the field sobriety test.

If you're smart you can have a good defense in place for the moment you get moved or if boxers actually watched their surroundings with see invis they'd notice when players spotted them and they'd preemptively circumvent the entire ordeal.