Sometimes your character is interrupted.
“It’s so dark in here. I can’t find the damned–”
The sound of a door creaking open made the children jump. Susan screamed, a short, breathless scream, before jamming her fist into her mouth.
This is not to be confused with someone who begins to speak, but then their words trail away into nothingness.
“Help me. I can’t find my son. I was looking right at him, and then he just, he just…”
“Just what?” the policeman asked.