Semangat mulungnya! Good luck for the week Kaela, Beejoe, Waowa, and Pemaloes!

Only Kaela can laugh in front of the gunman without getting killed

it doesn't spawn monsters, it shortens the respawn timer when they die or despawn. making noise in general shortens the respawn timer.

careful kaela the old man can hear your silent laughter

so for headman, you need to break LoS if he spots you. you won't be able to outrun him, so either dive under cover or even dodge past him to lose him.