What makes our movie a thriller?

Our movie opening might seem more like a film in the war genre, but we have placed a few thriller elements in our final peice in order to make this film a thriller and build suspense.

For example, There is a shot of some blood running slowly down a tree trunk and dripping off onto the ground, with tension building music playing for the soundtrack. This creates a thriller feeling to the movie, becuase the Audience knows what the two main characters are walking into, but they cannot help them, building tension as the two main characters walk unknowingly into danger. This could also give mystery to the film becuase the audience don't know what has left this blood trail, whether it some creature or enemy soldiers.

As this is only the opening to our thriller, the rest of the movie would contain more suspense and tension building moments.