Pennsylvania Supreme Court Justice Ronald D. Castille fretted, during an oral argument in Pittsburgh last week, that allowing an intentional act to establish multiple “occurrences” requiring liability insurance coverage would make policies impossible to price.

In the argument, the state justices were asked to decide whether a mentally ill man’s shooting spree constitutes a single occurrence for insurance purposes or six occurrences to account for each person Richard Baumhammers gunned down in April 2000.