Right now would be a good time to start building up proof that you / your friend own the domains (screenshots, screenshots of WhoIs, receipts, even if it means going to the registrar and getting them).
That way you can show that they are your domains.
		
		
	 
IMHO that won't matter in this case. Andrew said this earlier:
	
		
	
	
		
		
			Joanne then did a credit card chargeback at registrar X, but  not for the domain names she transferred to Z...only the domains that were still at registrar X.
		
		
	 
Practically all registrars catering to end users have a term in their registration
agreements against chargebacks, many of which likely state they'll take back
ownership and lock them out unless they pay their fees. It'll hardly matter at
all if those domain names still show the person's name and all, as long as that
registrar shows the person "breached their contract" due to the chargeback
and were never paid for them.
True story: in my registrar days I dealt with a customer who, get this, asked
us to refund his registration fee...
...a few days before the domain name expired.
His reason? He wasn't able to "use" it as he planned, though I forgot what his
intended use was for.
When I told him politely we don't refund, he threatened to do a chargeback. I
couldn't tell him to do that as our policy that time was to be 
so darn nice, so
I rather "apologized" we couldn't do what he asked and stood inspite of what
he reasoned out.
Unfortunately I never checked if he followed through on his threat, more so if
it became successful. Got caught up with a gazillion other things since then.
Whatever happened with Andrew's acquaintance towards the registrar, he or
she believed s/he was "wronged" by them and later did what s/he figured was
the thing to do. To the registrar, they then got "wronged" by the person who
did those chargebacks and did what they likely stated in their contract in this
instance.
Pretty much it boiled down how to one would enforce their position. It turned
out...ugly.