In this video we copy the line Vector3.forward and change Vector3 to -Vector3.
Is there a specific reason that we are using the negative on the vector3 as opposed to Vector3.back?
Hi,
No, there is no special reason. I assume Rick wanted to show that we are able to do some vector maths here. In our case, Vector3.back is the same as the result of -Vector3.forward. 
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I also just implemented this with Vector3.back … It’s just mathematics, wherever you want to factor in that “-1”; still, one could argue that sticking with Vector3.forward makes sense as well: intuitively, this is saying “we’re not changing the rotation axis, but we are changing the rotation value” where a negative value indicates rotating in the opposite direction …
But well, tomato to-mah-to Depending on how you look at it and formulate it, I think both can make just the same amount of sense 
(you could say that a rotation cannot be negative, so it’s the axis that has to flip if you want to rotate in the other direction)
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