Darlyn
I would never suggest that you should be the guinea pig, the one to test the eBay system but is certainly would be interesting to see this carried all the way through to leaving him a neg, exactly as you have suggested (referring to NPB as an eBay employee).
As an employee, is he taught to leave or not leave retailiatory negs?
As an employee, will anyone else at eBay become involved to "talk to you" about alternative solutions than leaving negs?
If eBay wants their employees to learn about how eBay works, then he should earn his neg and have a strike against him for being a NPB and I would suspect that eBay would be aware of this from an employer point of reference and use it as part of an employee review.
Lets face it, if eBay employees are left to learn they can abuse the system of their employer, then what becomes of the eBay system as a whole?
Malcolm