Question about the definition of global damage for things like aspect of the panther, does this global damage increase minion damage?
No, it is “your global damage”. So it will only affect the player character, not the minions.
Yes, but because Sabertooth’s Endurance states that Aspect of the Panther now affects it, this node is a source of extreme confusion and I’ve seen this questioned asked many times. I’m also still not 100% sure if this node does affect the Sabertooth or not (although I would assume that it does not due to the wording).
This node should most definitely have some additional text added to it to clarify if it works with the Sabertooth or not.