That is quite ways to go prusiking - anyone who's done it knows that prusiks are only good in theory. Either carry a gri-gri 2 or some sort of mechanical ascender (WC Ropeman is small and light), or the leader could've helped - there seems to be enough rope to throw a biner down to do an assisted raise.
I tried to ask that (lower my rope) after I couldn't get the ATC unlocked and was quickly told "no, i'm waiting for them to come up" he did not want to hear any more. So, since i was on a quite comfortable ledge and he was the one hanging I said whatever you want.