Help: Proton Packs (Ghostbusters 4th Ed)

[Toaster]

I was super excited to discover a rule book for Ghostbusters. But I am having some trouble understanding the mechanics of proton packs, particularly the [Bio-Electric] ones for fighting coporial undead.

Originally Posted by Ghostbusters.53

The target makes a Will roll against the field to escape each turn, until the running total of the field’s power is higher than the ghost’s ST+Will. Each additional bio-proton beam decreases the ghost’s roll by -2

the bit about the "running total" is what throws me the most. I wish the book offered a sample combat. If any of you have run a GB game or can help me better understand I'd be very greatful. thanks.