Sasuke's Susanoo is in the shape of a hawk. O.O
Attacks from below the feet is also a weakness. Naruto in Kyuubi mode can use the cloak to send rasengans from underground.. possibly?
This is a Hawk...
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This is Sasuke's Susanoo...
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Just because it has a beak shape to it does not mean it's a Hawk. You may notice a Hawk has wings,Talons and Feathers....Derp
The Susanoo can be removed from the user just like when Gaara did it. It can be pushes away from the user just like when Danzo did it. And it can be reached as you say from below.