Since recent patch, Headshot Booster and Headhunter do not proc on Kinetic Carbine headshots. Weakening Headshot and Crippling Headshot both proc as normal.
To test, buy the items and then headshot with carbine.
The damage returned by rebuttal is not amplified by the rebuttal owner's damage amplification (i.e., Pocket barrage, Geist malice) nor reduced by outgoing damage reduction (i.e., Cursed Relic).
The damage IS amplified by damage-taken-amplification (i.e., Infernus napalm on target into rebuttal...
Scourge aura damage is unaffected by the -8% dmg penalty from Cursed Relic
Place Scourge on self or ally while carrying Cursed Relic and watch total damage of Scourge aura with and without Cursed Relic. It's the same. Does not matter if the Cursed Relic owner is the Scourge caster or the...
Stamina usage disables (i.e., fury trance and capacitor) do not disable wall jumps after the first, in spite of the 0.5 stamina cost. You can wall jump as many times as you want subsequently, costing 0.5 stamina each.
To test this, enter the hideout or simply enter any game or test room, etc...