Controlling ragdoll in animation

Hi, I am new here, so sorry in advance for any supid questions.
I am trying to find a way of getting controll of a physics based ragdoll animation in the actual animation (say around frame 80) the ragdoll setup is simillar to the one in

I tried to do it with a disabled fixed joint and then enabling it with a keyframe, but it seems to snap back to it’s original position on the first frame. here, you can see it

Is there a way for it to just continue from it’s position at frame 79? I’ve tried googling, but couldn’t find anything…