For the first one: Can talk about what they saw, heard, felt. For example, “they felt like they were being followed”, “they heard a very alarming noise”. You can develop the plot as you go.
For the second one: “I couldn’t believe what I saw next. My body went numb as my mouth dried.” Could either be something scary or surprising.
The third one: Can talk about the temperature, surroundings, 5 senses. Could recall to a dream or go and check what seems off.