I think it is called sentence subject. Sorry if I am wrong.
The answer to the first blank above would be ''decisiveness'' and the other would be "unscathed". Possessing strong resolve or decisiveness is sometimes needed to escape unharmed or unscathed during stressful times or situations.
He paid 1,250 in total.
800+250+200=1,250.
It can allow a community to elaborate on said hoax and spread several variations of it.