I will answer it here briefly since its been raised. The assumption of a sweep is that once the sweep is completed, that is, both sides have "engaged" each other, that the fighters are free to go elsewhere, just like any other objective in FSO. There is no set restriction to fly elsewhere, as long as the 1st task is done; ie CAP or ESCORT, or whatever.
If that was not clear, we will look at a further clarification in the objectives when they are sent.
I would ask that nobody jump to conclusions. If you have a concern, sent a msg to the CM and state the problem.