A very good interpretation Unge. This person was shooting words of criticism towards Fred and it was probably meant to get other people to doubt in his authentic calling or position in Christ or at his work situation. You are right about the fact that this person wanted to destroy him. The eyetooth is the human version of the K9 tooth in animals. It is a very important tooth. It is used by animals to kill and with humans, it is the most important tooth to use to digest the word of God or the truth correctly.
By the way, I like the advice that you gave Fred. Well done!