I don't really understand where the dificulty is.
The perspective is wrong in a number of ways so we cannot rely on that. We have an attack without a step from the man on the left, an defense with a step from the man on the right. I'd suggest it was a step backwards and a rapid cut up into the arm of the agent. Though this is because Silver does something similar against a lower blow. It may well be a step forward though, I doubt it as the distance between them is still reasonable and the agent has closed it to some degree.