Alright, this still works has not been patched. Tested it with a friend.
NO! This is not a duping method, this is simply confusing the server so two people can catch one imp at once.
This is how it works step by step.
Both you and a friend get on skype or vent, best communication. Both stay together with entangles or binds. When you see an imp you want to glitch, entangle and say it on vent or skype. Both stand a square away and count down to 3 so you both catch it at the same time THEN WALK ONE SPACE AWAY so the imp does not vanish.
The reason of why this works: You can not try to catch an imp somebody is already trying to catch. This confuses the server as both people try to catch the impling at once, it will glitch so it's possible one person catches it and the imp still stays. If the imp stays and one catches, walk one step away, entagle again, repeat the process and you'll keep catching it.