When Nathan is hanging off of something his fingers start to tremble and he has to reposition them. Will make a gif out of that, very neat detail that i only noticed during my second playthrough...
Edit: Here it is
Edit#2: That only happens if he is only hanging by his hands. If he has both hands and legs on something he is more stable and the trembling doesn't happen!
Edit#3: It also happens if you have less than 10 fingers when Nathan has his legs on something
Example (2 right hand, 4 left):
8 fingers, more comfortable position
Edit: Here it is
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Edit#2: That only happens if he is only hanging by his hands. If he has both hands and legs on something he is more stable and the trembling doesn't happen!
Edit#3: It also happens if you have less than 10 fingers when Nathan has his legs on something
Example (2 right hand, 4 left):

8 fingers, more comfortable position
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