If you miss one you have to start the sequence all over again, plus it can mean some damage is done to your party when up against particular enemies. (useapotion.com)
In later missions, you'll start to notice there's usually always one particular enemy fighter that will relentlessly target you until either one of you is dead. (n64today.com)
While units can be deployed however a player wishes, certain ones are more ideally suited to destroying particular enemies. (vrfocus.com)