It's a metaphor, see: You put the killing thing right between your teeth, but you don't give it the power to do its killing.
Metaphors have a way of holding the most truth in the least space.
Least Metaphors Most Space Truth
Tomas did not realize at the time that metaphors are dangerous. Metaphors are not to be trifled with. A single metaphor can give birth to love.
Using a metaphor in front of a man as unimaginative as Ridcully was like a
red flag to a bu... was like putting something very annoying in front of
someone who was annoyed by it.
Clearly, America has no shortage of metaphorical opportunities for the poor.
A metaphor is like a simile.