Great Weapon Master Redux

You've learned to put the weight of a weapon to your advantage, letting its momentum empower your strikes. You gain the following benefits:

• On your turn, when you score a critical hit with a melee weapon you are wielding with two hands or reduce a creature to 0 hit points with one, you can make one melee weapon attack as a bonus action. 
• While you are wielding a melee weapon with two hands, you can’t be knocked prone or moved along the ground against your will unless you are incapacitated.