Apo Hunters can knock you down even though the skill steady feet

Platform:
PC Win 10 64bit

Description:
The apocalypse type Hunters have shoulder mounted granate launchers that fires airburst cluster bombs. If those bombs hit you it will knock you to the ground even though I have the skill steady feet.
This is very wired because with the skill you are able to withstand the shockwave attack of prototype and military type Harvesters and Tanks. Even the mortar attack of military Tanks are not strong enough to knock you off your feet and this is one big explosion instead of several small ones.

Steps To Reproduce:
Spend one skill point on the skill steady feet and fight a apocalypse type Hunter. Stay at a certain range and it will fire the granate launcher. When the explosion hits you, you will get knocked down.

Images / Videos:
no sorry.

Host or Client:
Host (single player)

Players in your game:
1

Specifications:
Intel Core i7-4770K
Nvidia GTX980
16 Gb RAM