Regretfully, it's impossible to recreate the short. It can happen at any time as the plates expand from heat and from the vibration of driving down the road. Since it won't start even with a jump, it could also be a bad starter with a flat spot in the armature or a slightly sticking solenoid that is drawing power, but I've never seen one draw the battery down and cause it to die while driving. A bad spot on the armature will only act up when the starter stops with the brushes on the bad spot. If it stops in another area of the armature, it will work fine.