the search event module returns an bundle for each successfully found event.
The following modules will be executed for each operations.
In my scenario i am searching for special events (operations) and save each returned event in a datastore. The calender is one with tv-show dates and i am searching for the ones which are running today and are on my special list.
The search (8 inputs) returned 8 outputs but with no bundles. In this case none of them went trough the filter because i got no bundles back. But if they do the following modules will be executed as often as the filter applies.