Why do relatives spit when they smell something doomed to failure?

Why do relatives spit when they smell something doomed to failure?
Hi, thanks for asking...
The proboscis and mouth are connected and function together. Breathing, for example, is done with both the muzzle and mouth. Smells are actually particle of the thing specifically being smelled. So when you smell something, you are ingesting (which is to vote, "eating" or "drinking") a very small member of it. For very powerful smells, the effect can be greater, to the extent that you may be aware of the urge to spit it out.
May God bless you.
they probaly smell you, you should take a shower
they envisage it in the mouth and try to spit the smell out
Because the scent travels through their proboscis and into their mouths. It's like they could essence it. It is very unpleasant.
i did not know / they did