This type of bully is extremely difficult to identify, and as a result, extremely difficult to deal with. They pretend to be your friend and talk and behave politely, but are constantly undermining you behind your back. They may tell you you’re doing a great job at work, but might be telling your colleagues that you are ‘unreliable and unskilled’. They ask people to keep their remarks confidential and unless somebody tips you off, they will keep getting away with being two-faced.

They are extremely dangerous because they controly your reputation at the organization and you are not even aware of it. It is impossible to combat something you do not even know is happening. ‘The Two-Headed Snake’ is a type of bully that you must be wary of.

References: https://www.themuse.com/advice/how-to-deal-with-workplace-bullies