Sound - Specially Guided Owl, will sometimes not make sound when getting closer.

I know it may not be super fair balance-wise, but I like the owl being silent.

Did you know that owls are the quietest hunting birds IRL? They have special branching comb-like serrations on the leading and trailing edges of their wings that during intermediate Reynolds number flow regimes (mid-flight) collapse the no-slip boundary region. This makes them slip through the air quietly.

Simple version:

Aerodynamic and fluid mechanics version:


Now, does this mean the spirit owl in the game should be silent? Well, maybe not for balance reasons. But the owl being silent while hunting makes me happy.
 
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