Premise:
"That's not just bogus"
Hypothesis: Everyone thinks that this is truly outrageous because of how bogus it is.

it is not possible to tell

Premise:
"When the snetha-knife kills, it kills completely."
Hypothesis: The sneth-knife can kill anything.

yes

Premise:
"The mob, reportedly acting on Cohn's behalf, threatened Davis with violence to force him into a sham marriage with a fellow African-American."
Hypothesis: A black person wanted to marry Davis and plans to.
it is not possible to tell