+24% damage increase to party member???

Hey Rogues,

[Improved Kidney Shot] (3/3=+9% damage) The description says "The target receives an adddition 9% damage from all sources while stunned by KS"

Does this mean all of the rogues physical/poison damage OR damage from every one who is attacking it? And if it's damage for everyone does the +15% damage bonus from Tricks of the Trade stack with it, resulting in a +24% damage bonus for a single party member for 6 seconds(?)

yes it means, but improved kidney shot is left unpick mostly because its the CC which will be insta trinketted.

I believe it means of all damage received, it causes the target to receive 9% additional dmg. So I would believe it's multiplicative. Ex. 100 base dmg --> 115 w/ tricks --> 125.35 w/ tricks and Imp KS. You can test it.