Originally Posted by M.Bonanni

I highly doubt the toe-in was the issue unless he accidentally went toe-out. You say you did or did not change the traction arms prior to the event? If you did, that's likely the issue as they can affect bump steer. Where exactly was it loose? Entry? Mid-corner? Braking? Exit? All of the above? If you answered all of the above its most likely a toe situation unless there is something mechanically wrong/broken that you didn't notice.