Those hairspring vibrators are extremely hard to come by, i have been trying to get one for the last 2 years, i saw one once listed for $400 on eBay and it was sold in minutes I didn’t even have time to click buy it now. Video slow motion is really the easiest way to do this.
The balance has a decent about of clearance from the plate and if it is making contact then the bend has to be right at the edge of the movement. Which still blows my mind how it can occur, not to mention if there was something forceful enough to do that then i cant imagine how nothing else is damaged. I would really love to see a pic of this movement. It should be in some kind of medical journal for watches.