did you depress the clutch during this stop? or did you just hit the brakes?
this could be a factor in the timing chain jumping, however i agree it's still a likely issue. especially if the stock timing set is still in use.
Odds are, I just bumped the stick into neutral to stop, it's what I usually do. I know the car was not in gear when I stopped, but could the clutch being engaged or disengaged have an effect?