Several months ago, I was in a session playing as a bard wanting to distract some bugbears while he snuck past. Understanding the goblinoid tongue, I heard one of them state he was starving. I used the phantasmal force spell on one of the bug bears, lets call him BugA. The desired effect was he would see one of the other bugbears as a pile of delicious food(BugB).
The phantasm includes sound, temperature, and other stimuli, also evident only to the creature.
BugA began to eat BugB, who of course, was not pleased about this and attempted to protect himself, mainly by attempting to hold BugA back and producing a lot of noise. Does the phantasmal force spell make BugA unable to hear BugB's shouting and requests for BugA to stop? (considering BugB is effectively obscured by the illusion)
For example. a target attempting to walk across a phantasmal bridge that spans a chasm falls once it steps onto the bridge. If the target survives the fall, it still believes that the bridge exists and comes up with some other explanation for its fall-it was pushed, it slipped, or a strong wind might have knocked it off.
Unlike the bridge example of the Player Handbook, the illusion covers a character that would be shouting and defending against the actions of the target of the spell. Would BugA continue to make excuses or ignore the noise produced by BugB?
To put it another way, if a source of noise is inside of an illusion of a box, produced by the spell phantasmal force, can it be heard by the individual who can see the illusion?