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I had a look at the forest chase scene in Harry Potter and the Deathly Hallows part 1 and thought about how we could put an original twist on.

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Using the same actor for every character means that we have to show the differences between each of them clearly, something Split did fantastically.

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We wouldn't follow this colour scheme, but there will be distinct colours that will make the different characters very clear whether we rely on colour grading for that or costume.

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There will be distinct differences in how the different characters dress. For example, the one with memory loss will be dressed in ragged clothing, while the doctor will be wearing a surgeon's coat.

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Directed by M. Night Shyamalam

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Directed by David Fincher

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Directed by Richard Ayoade

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In order to create something with suspense, we can make the general feel of it be slow when it shouldn't be. This is how I'd do that in editing:

The change from one shot to another be gradual and not jarring in any way so as to lead up to a moment- Unsettling

The soundtrack steadily increase in pace, pitch and volume

Use a voice-over to suggest that something bad is going to happen.

Don't use any shots that illustrate the danger fully and allow it to be a mysterious force to be feared shown by other characters.

Juxtapose the content and feeling of the product through misleading editing styles.

Use a lot of fades in time with music to figuratively and literally put the viewers 'in the dark' while making them think they've missed something vital so they continue watching.

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In order to create something that's intense, we have to make the general feel of the trailer to be shocking, fast paced and loud.  This is how I'd do that in editing:

The cuts would be sudden and timed with the music.

The shots will be short and quick.

Use a lot of diversity in camera angles and shots.

Emphasize every action and movement.

Use a soundtrack with fast pace, strong beats and high pitch.

Use a variety of colours and different lightings to make the scene constant in change.

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Considering we're just making a trailer, it'll be hard to show all the codes and conventions of a psychological thriller as we don't want to give too much story away. However, the codes and conventions that we can show involve:

Low level lighting

Black and white coloring

Claustrophobic spaces

A theme emphasized by font and colour

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As an overlaying feeling and consistency throughout the film, a psycho-thriller would have:

Death

Reality

Identity

Existence

Purpose