No, this isn't the case.  After Qf3, Black plays Nf6 and he is fine.  White should play Qe2 when play goes Qe7 Qxe4 d6 d4 dxe5 Qxe5 when White emerges up a pawn

Yes -- Qe2 is better, and has won me either the Black Queen or Knight on a number of occasions.  Black capturing the Knight immediately is actually a mistake -- with a little patience he will get it back.

No, what I mean is this could prevent people from copying your moves, so if he movs those moves, he is not copying my moves already, its just a way to stop people from copying your moves

I want them to copy my moves!  Rather than winning material, I'll just mate them if they keep copying!

then its your choice