Safety alert: Dremel tools and long shank bits

Drilling using a 2mm cobalt bit in a Dremel handheld tool. I withdrew the bit from the new hole, and went to turn the drill off using the speed selector in the handle. By mistake, turned the speed to max (12000 rpm?). The drill revved up in no time, then there was an increase in vibration, the bit bent and snapped, and was flung violently across the room. If my eye had been in the way, that would have been it. There was enough imbalance in the bit for the very high speed to cause it to bend to the breaking point, almost instantaneously. Take care, I note that the couple of bits supplied with the tool are short stubs, possibly to avoid the problem I experienced.