So, i have double-checked this with all hunters on my discord/guild.
They all report that it is impossible to do the Feign Death -> Trap combo.
Either manually, or through macro.
It NEVER works out in the open world, and it works some times inside dungeons.
As it is, hunters are broken cause they have zero chance if a melee gets the drop on them.
Please report this class-breaking bug, thank you.