Sledge hits party members. Bug or working as intended?

[Shockwave1]

Allied and Partied group of 2.

 

If I place a sledge in a door way I can walk past it to hit zeds no issue. The sledge will never hit the "owner". However the sledge will hit the allied party member if they try to hit zeds in the door way. It won't target them, but while it is attacking zeds, it will ragdoll allied party members (which usually gets the killed by the zeds). If the owner is immune to the sledge then party members should be. If party members are immune from a junk turret shooting through the door, they should be immune to the sledge as well.