You may want to have your friend spend some $$ on a real patent attorney ASAP. Your statements point out you have no real understanding of how patent law works. Depending what actions they have taken and when, some of their potential IP rights may be about to go kablooey or may already have gone kablooey.
For example, you stated that they have a Chinese patent on this invention. Depending on when that happened (and if it really happened, or an application was filed but not issued or some other thing) their rights may have already disappeared or the clock is ticking. Please read 35 USC 102 very carefully and/or hire a patent attorney to help.
http://www.uspto.gov/web/offices/pac/mpep/documents/appxl_35_U_S_C_102.htm#usc35s102
As another example, you stated you advised them to file a provisional application. If they want to (and still can - who knows if they can) use the filing date of the Chinese patent as a priority date for a US patent application under 35 USC 119, they cannot do that with with a provisional application. See 35 USC 111(b)(7).
http://www.uspto.gov/web/offices/pac/mpep/documents/appxl_35_U_S_C_111.htm#usc35s111 Claiming priority or not has impact on their rights and is not something to decide upon lightly.
Again: It may be wise to have them talk to a real patent attorney ASAP.
This is not legal advice. I am not your lawyer or your friend's lawyer. This is merely a suggestion to have you talk to a lawyer to actually get some legal advice from that lawyer.
Edit: Oh, looks like chusteczka pointed you in the right direction already.