Because the Death was about to reactivate - and it's my job to not allow rulebreaking? It was either I tell him it's activated which he mustn't have know or he gets slain and warned. Also, there was a corpse than the runners could easily see right next to the trap.

Because the Death was about to reactivate - and it's my job to not allow rulebreaking? It was either I tell him it's activated which he mustn't have know or he gets slain and warned. Also, there was a corpse than the runners could easily see right next to the trap.