The clip from Fatal Attraction interweaves two contemporaneous narratives: Alex is trying to stab Beth in the upstairs bathroom, while Dan is in the kitchen downstairs about to make tea. This editing device is known as.

Cross-cutting

Explanation:

Cross-cutting is an editing technique to show simultaneously actions that occur in different places (or times). In a "Cross-Cut" the image goes from one story to another. This technique is usually used to relate (or confront) the subject that the different narratives deal with. It is also used for the purpose of increasing suspense.