Well, anyone who has seen the Red Baron movie just KNOWS that Manfred actually shot down Roy twice. :)
Once as a pilot of an R.E.8 and then once in this very Camel (he crash-landed nearby with his red Albatros and had a chat and a drink with Roy, who told him to make a pass on that nurse who had treated Roy after the first time he had been shot down by Manfred, before Roy decided to escape from the prison camp). Then Roy shot him down and killed him and returned Manfred's white scarf to the very same sexy nurse who crossed the lines to see his grave.
*sighs*