So, here's the question:
As a rigger can you open another rigger's pack job, shorten the closing loop, reseal, and make the note "opened, shortened C/L, and closed, did not disturb pack" on the data card, without opening yourself up to liability?
or the short version
At what point are you responsible for the pack job? "A superior skydiver uses his superior judgment in order not to demonstrate his superior skill."