cover their mouth, ears, and eyes.
This seems impractical. If this thing needs direct eye contact "Periscope Googles" if it needs the target manipulated by exact words to do stuff, have a interpreter between contact.
Microphone transmitting to someone offsite who does not even need to know that they are speaking with an anomaly (changed periodically). That person than says a similar thing, which is than transmitted to an earpiece of the one interacting with the target.
Fighting Monsters and Language since 2016.