You dream you are chasing someone through the fog, you lose sight of them, and suddenly realise that the tables are turned and they are now chasing you. You feel as though you are running through treacle as they get closer and closer to you.

Being chased in dreams commonly represents avoidance - the dreamer is running away from a confrontation, responsibility, or difficult situation. The reversal (chaser becomes chased) suggests that whatever you're avoiding is catching up with you. The feeling of running through treacle (slow, difficult movement) reinforces this sense of inevitable confrontation.