Thanks very much for all your replies guys.
Alot of the stuff you suggested make perfect sense. It may be uncomprehensible what he says but it sure is interesting to speculate. I like the one where he was suggested to say "even" as it not only shows that they are trading something, but the Elder says that Harrigan is "even" with him for beating one of his own. He sees him as almost an equal hence giving him a reward. I also like the other suggestion of "now go" as in "gtfo before this ship blasts off", I remember in the comic adaptation he is literally pointing with his finger to the exit like "now shoo".
To be honest, I can't believe this thread is still alive. It's been ages since I was active on the forum. It means alot!