Collision problem


I’ve a sword parented to armature’s bone, the armature is called ‘ArmatureHero’.
The sword is colliding with the ‘ArmatureSkeleton’.
The collision’s result is reflected by the ArmatureSkeleton property hc (hit counter) = 1.
Screen for this is: parent_static.JPG

In above scenario ‘ArmatureHero’ was static actor.
When I turn it to dynamic I get no longer collision and there is weird rotated sword marked by me on beneath parent_dyn.JPG.

I want ‘ArmatureHero’ to be dynamic and to have collision working , what to do ?