Okay so, while using Machinima Maker Mod, ive noticed that if you press "grab" while using the fighting style "J_Melee" (Casey and Bo) there will be some sort of a power tackle with a small charge to the opposit side.
Like Casey will half courch and lean with he's body and then jump leaning he's body to the enemy in full power, impacting them with he's shoulder.
I have no idea if this was discovered or not, but hopefully it'll be usefull.