  We know from previous work \cite{clark} that non topological solitons, Q
balls, evaporate into fermions. All the constructions we used to find
evaporation rate were dased on the fact that no fermions would move towards the
Q ball. All these constructions left an opened question that is : what happens
when a fermion interacts with a Q ball. We shall answer this question in this
work by using the constructions done to compute evaporation rates. We shall
also obtain a new approach to compute evaporation rates.
