Flash: They would have to do it during the playoffs. Now is not a time when the terrorists would be active? No, Flash is conveying his annoyance that the terrorists might strike during a sports event that he would like to see in person or watch on TV.
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MadhulkThey would have to do it during the playoffsI'd just add to the previous reply that this is a special use of the modal would called "propensity". In this use would is always stressed to give an emotive effect. Here's another example that may help: