I have heard stories like that locally with R/C tracks, even though the two involved weren't exactly close. Unfortunetly, without being part of the inner circle of the accused or knowing what the investigators have found, we would just be speculating until the investigating is done and/or someone talks. If the guy was known to have pissed people off, I wouldn't totally be surprised if yet another person went mental and this time only took it out on the business and not the staff or customers. We have had to ban one customer from coming back a couple years ago for calling drunk and argueing with everybody but myself, had another guy who was associated with the Magic tournaments get kicked out and told not to come back before that by us and other places that do FNM because of his douchebag lawyer attitude! The store manager had to throw somebody out on the 26th because of his behavior in relation to a defective vehicle that he bought from us and we would have get taken care of for him.