Gravity gun can punt ground.

[TheVogels]

The item "weapon_physcannon" can punt the ground.

I'm not sure if this is just a weird entity in the flatgrass map.

It's a entity.

[Bonyoze]

should be a simple fix:

function ENT:GravGunPunt()
    return false
end

[TheVogels]

I just realized that is just a bugged entity in the map.