For one, we all (well most of us) know you cannot trust a thing that comes out of Fisher's mouth.

Second, I have a feeling there is a contract with Fisher's name on it if he meets certain conditions. read:wins
And Fisher feels he either goes into 1)play the rookie mode 2) Stay with Keenum and try and win now to save his job.
I don't think Fisher feels he can do both (play the rookie and win enough games to save his contract.

Fisher is not going to be fired and he knows it so he is going to do whatever he feels is in his best interests, because his contract is either going to expire and he moves on or he is extended.

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Don't waste your time looking back, you're not going that way. - Ragnar Lothbrok