SmallSorter, your BA should make the following points, if appropriate:
Walking across a stopped belt is NOT a Cardinal Sin. (It's not even a venial sin.) If you are fired and out of work, this is a violation of Article 7 and you are due your job and back pay.
Article 7 --- Local and Area Grievance Machinery
Except in cases involving cardinal infractions under the applicable Supplement, Rider or Addendum, an employee to be discharged or suspended shall be allowed to remain on the job, without loss of pay unless and until the discharge or suspension is sustained under the grievance procedure. Notwithstanding the foregoing, any superior provisions in Supplements, Riders or Addenda shall prevail. The Union agrees it will not unreasonably delay the processing of such cases.
UPS policy is "Don't walk on moving belts." Your belt wasn't moving.
UPS policy is that you can walk on a "secured" (or "locked-out") belt. Belts are secured from time to time during a shift; and always at the end of the shift, to allow a final check for packages. You were crossing the belt at the end of the shift and could assume it was secured.
UPS policy is no belt can start without the hard-wired warning buzzer sounding. If you heard no warning buzzer, then the belt wasn't about to start.
If you knew the location of the Start button, and knew it was secured, and no one was near it, then you knew the belt couldn't start.
If you knew where the start button was located, but didn't know if it was secured or not, but saw no one was near it, then you knew the belt could not start.
If there was no diverter or packages near you on the belt, then you knew you could not be tripped by a diverter or package.
UPS policy is that it
is permissible to walk on
moving belts
if they are two or three feet or less off the floor. These belts (called "gathering belts," I think) are what package cars are unloaded onto. Unloaders walk on them all the time while the belts are moving and while packages are on them. If your belt is such a low belt, you can walk on it, especially if it's stopped. If your belt is slightly higher, walking on it while moving is against UPS policy but can't be that big an offence, because a waist-high belt that is stopped is only a foot or two higher than the belts you can walk on even while moving!
UPS Policy is that when a belt is to be started, the starter must visually scan the belt to see if anyone is on the belt. If they are, he must call out to them and wait until they are off the belt before starting the belt. You knew this and were listening for such a warning call and heard none.
If you crossed the belt perpindicular to its length, you were on the belt for only two seconds. No one could start the belt in such short a time.
If you walked down the belt a ways, then you were on the belt longer but still not a mortal sin.
Despite Company policy to the contrary, workers and Supervisors nationwide routinely walk on stopped and moving belts, and sometimes run on them!!! That is, when they're not walking in the yard without their reflective safety vest. Or speeding around the building in their personal car.