An enemy wants to ambush the party but wants to talk first.
he creates a major image while the party is some distance away then when the party is close enough he has it walk into the middle of the road prompting them to stop.
from about 30 to 60 feet away he starts talking to them, conversation doesnt matter he is basically declaring his intention to kill them.
its likley that the party will charge or shoot the image which will prompt his attack.
my question is this.
BEFORE any attacks are made or any one gets any special interaction with him. while he is standing in the road declaring his intention to kill them all for the glory of his master.
should the party get will saves to disbelieve?
note: this assumes that they have not used any special spells or abilities like detect evil/magic/etc, nore have they had any back and forth conversation. although I wonder if back and forth conversation with the caster in control would make a will save or if interaction means direct phisical interaction.