Those two actually joined Rhodes Island with Cardigan, not Melantha. :P
But they're in A4 when the doctor returns to Rhodes in Ch1, so this would make sense.
Hmph.....So you're the Doctor?I don't expect you'll be holding me back, at the very least.When I first saw you, that's the type of girl I thought you'd be.SorryW-wh-what kind of impression did you have of me?!I'm not the scary kind of girl you thought I'd be though......Unexpectedly fitting, huh?Handsome guards protecting their princess?What're those two doing on your sides?