THe standard shocker has no ball detent and as its a closed bolt marker, then if there's a paintball in the breech when you point it down then yes it can roll out.
The reg 'leaks' for a sec because the long string of rapid fire you shot causes the reg to open up to allow lots of gas to flow through. When you stop, the reg cannot shut quick enough and a bit of extra gas goes into the gun, raising the pressure (slightly) above what it is set at (around 180 psi on shockers). The solenoids in the shocker can be damaged by pressures over 200 psi, so overpressuring them, even temporarily, is bad. The reg is clever and knows whats happened so it just vents the excess pressure from the bottom, hence the hissing noise.. There you go.
Finally. voncringle is correct that it ices up because the co2 is expanding inside the reg. It is worse on a shocker than on say a spyder because the shocker runs a lower pressure in the reg thus the gas has to expand more to get tot the lower pressure. Hence more expansion means more volume of gas and more volume of gas means more cold. If you've done A-Level physics you will know whatshisnames gas laws (? Boyle's ?) that state:
Pressure = Volume * Tempreature
This can be rearranged to make
Temperature = Pressure / Volume
When the reg does its job, the gas pressure drops and the volume increases. Hence the temperature must drop as shown by the equation above. This is a bit of a simplification but it shows the point
Hope that is more than enough detail for everyone,
Tom
