I just opened this piece and I can't figure out how do you keep the inner jaw to stay out? The sliding knob on the back of its head seems spring loaded, and when I release it, the jaw goes back inside the mouth.
The trick is leverage.
I suggest you find an open area as you might have to stand up.
Use your thumb to push the lever all the way forward.
If you hold the figure above your head, your success rate will go up.
Now slam dunk it into the trash.