Does the "jaw falling" mean that "it hurts"?
Side note, english is not my native language, and I learned english only from movies, cartoons and video games.
So my english may not be very accurate... anyway...
A synonym to this sentence could be:
"Ugh... My jaw hurts!."

A Grim Reaper's presents awakens the slumbering soul from the dead body to be guided into the afterlife. Until then the soul lays dormant in "hibernation" (but there are some exceptions, "the undead").
Normally the soul should raise from the body but in Lenin's case his soul was bound to the body using "containment spells".

Подарки Мрачного жнеца пробуждают дремлющую душу из мертвого тела, чтобы отправить ее в загробный мир. До этого момента душа пребывает в «спячке» (но есть и исключения - «нежить»).
В норме душа должна восстать из тела, но в случае с Лениным его душа была привязана к телу с помощью «сдерживающих заклинаний».

You're right... I've took a look at the image database and noticed that it has both metric and imperial. So I've just erased the imperial system.