Vader and his two wingmen easily outmaneuver the Y-Wings.
Actually before paragraph it says:
Vader notices Dutch and his Y-Wing group
Here, his Y-wing means Y-wing belongs to him (Vader).
Why Vader outmaneuver his own things?
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The Y-wings don't belong to Vader, but to Dutch.
The sentence is ambiguous because "his" could refer to either Vader or Dutch.
When you are writing, you should try to make it clear who or what a pronoun is referring to.
Sometimes it's clear because, for example, we say "his" and there is only one male in context that this could refer to. Like, "Bob gave Sally his book." Clearly "his" refers to Bob because if it was Sally's book we would say "her". (Assuming there's no other male in context.)
Sometimes we make reasonable assumptions based on our general knowledge of the world. "The doctor examined the patient with his X-ray machine." We assume that "his" refers to the doctor, because we don't expect the patient to bring medical equipment for the doctor to use. If the normal assumptions a reader is likely to make aren't valid, you should use words that make it clear.
In this case, there are a couple of clues. The biggest is that, from what I recall of Star Wars, Vader was on the Imperial side and "Y-wings" were a type of fighter used by the rebels. So it would be unlikely that Vader would have a squadron of Y-wings under his command.
Second, even if I didn't know this, it says that "Vader noticed Dutch and his Y-wing group." Vader is noticing two things: one: Dutch, and two: "his Y-wing group". It seems likely that Dutch and the Y-wing group are related to each other. Further, it seems unlikely that Vader would "notice" his own people. Doesn't he know they are there? And it would be odd to group his friends and his enemies together under one "notice". Not impossible: I suppose you could say, "He saw the enemy attacking and his own reinforcements arriving."