[Matt C]

Sounds like a question for the GDC.

My first question to you though would be, what would this net be pulled by to extend out of your envelope, since no device can exit another robots envelope to enter yours?

If it's designed in such a way that it always deflects to some extend I'd say it most likely would violate the envelope rule.
If it would be some sort of accidental thing that COULD happen, but would not give you an advantage and would not be considered "normal" operation, then I would chance saying it's probably not a big deal, but would obviously be at the discretion of the refs and/or inspectors.