Juice Injector is the ability of the Gladiador Supremo. It boosts Dani's speed and health and lets you do machete takedowns on any enemy, even mid-firefight, which makes it the go-to Supremo for close-range brawling.
Fire it off and Dani gets faster and much harder to kill. While it lasts, you can run up and machete anyone, even with guns pointed at you. Use the window to cut down the toughest enemies in the area and save your ammo.
Reach rank 5, Cabo, then buy the Gladiador from Juan with Depleted Uranium.
Yes if you like getting in close. Some gear can give you a similar speed boost, but nothing else lets you take down armored enemies mid-fight.
Rampage makes your gun free to fire for a while after melee kills, and Sturdy stops melee hits from knocking you down.