They spit, his, growl... alk sorts of sounds to try and scare you.
And boy can they scream.
“Who else spits?”
Bernie.
Chris Matthews.
According to deliverance ministers, spitting is one tactic that demons/devils/evil spirits in a person use while being forced to manifest, in order to stop or distract the deliverance process, to aid in their resistance of being cast out or expelled.
They do other things, too. Here is a deliverance service by Pastor Win Worley, of Hegewisch Church in Highland, IN, 1987, which becomes quite lively about 45 minutes in.
Part 1 (entertaining sermon on how to be delivered from your evil spirits)
Mass Deliverance - FULL VERSION (1 of 2) -
https://www.youtube.com/watch?v=HsVLs89YkVA&list=PLXuMMPwbstM9gwCNUNeriM_BV0TyY69Ph
Part 2 (the manifestations portion begins at minute 10)
Mass Deliverance - FULL VERSION (2 of 2)
https://www.youtube.com/watch?v=mVG3ow2-MR0&list=PLXuMMPwbstM9gwCNUNeriM_BV0TyY69Ph&index=2