Based on what does he mean "both?" Because based on the fight itself (in which Vader is canonically described as toying with them), the fact Vader doesn't rush to stop the Ghost from leaving but rather calmly walks away, the fact Vader doesn't try to TK the ship despite it being well within his canon TK abilities, and the fact Vader clearly anticipated the Ghost's escape from orbit, I think it's "clear" he's referring to the final instance.
Nothing in the lightsaber fight "diminishes" Vader in the first place, while the ending of the space battle currently does. In one instance, Vader's clearly the superior, while in the other, the Ghost crew does, in fact, outsmart the Dark Lord. There's a clear comparison. Given the show is made for young kids, and that this fact should be obvious to them, and then the fact you don't understand that, means: https://www.youtube.com/watch?v=eBPqksG9nbA