What happens if a target asks for an stage to the HOP, the hop answers to the target (and deletes it as far as I understand), but the stage execution fails on the target, so the handler doesn't create a new session. As far as I'm understanding, a new stage is not sent to the hop, so, next targets asking for the stage won't get nothing, right? 

(I'm thinking on a browser exploit for example, with multiple targets being exploited at the same time, I guess could be a problem).

Maybe I'm misunderstanding something, please feel free to clarify, I just start to look into it :)

thanks!