That is absolulely correct - there is no "brandishing" statute in Indiana. Does that change anyone's answer?
No, It's still intimidation. If I got this call, I'd speak to the parents and ask if they wanted you criminally liable. I'd try to sway them into just allowing me to come by and talk to you and leave it at that (assuming you're one of the few that would actually talk to police...lol).
If they did want you held responsible, I'd show up at your home get your version of events (not arrest you), and forward a PC to the pros.
The threat you communicated is clear to the average person. "Communicated," as cited by Indiana code, isn't confined to verbal speech.