"I probably would have said something about how "since the original proposal numbers were far off what your recently hired L believes to be fair, (esp since the partnership interest was not factored in...) but sure, you'll send it on over to your L for their any additional feedback."
Why do I differ from 25, you ask? It is because by using these words, you're giving H ammo to charge ahead and twist it around to make it in such a way that you're the one that is making this process difficult. Be damned if you dare to EVEN suggest that H's numbers are voodoo! I just can see where H would get all hot and bothered by this comment.
Which is why I lke this vanilla response:
H, thanks for getting back to me on this. Yes, I do have the proposal you sent a while back. Please give me your L's email address and a phone number so my L can get in touch with him/her regarding your proposal. Thanks. M
How can H argue with this text? There's nothing for H to counter back or arugue back with right there.