I once told my 4th grade teacher (a woman) that I'd kill her. She laughed at me and said I was overreacting.
In all seriousness, threats like these should not be taken lightly. Austin was right to be reprimanded. From my understanding, he was feeling very overwhelmed after losing to RBY and wanted to quickly get away from anyone and everyone to vent. He didn't behave appropriately in that situation so I'm not saying he should get a pass, I just don't for a minute think he had actual violent intent at that moment.