Remembering your post from a few weeks back and reading this, the best thing I can suggest is to tell your boss straight out you ain't right for the job.  You can always point out the other guy's mistake and tell the boss you wouldn't want to be responsible for anything similar.

As for being slow and/or retarded, you ain't.  You're articulate enough with a keyboard.  Not everyone finds it easy to converse so don't be hard on yourself.

Coppula eam se non posit acceptera jocularum.

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