When you’re under attack from a player on a higher elevation, find a surface you can attach a floor to above you to create a ceiling.
When you’re trying to get from one place to another and find yourself under assault from above, that’s a pretty bad situation. However, it is not completely hopeless. When you’re under attack from a player on a higher elevation, find a surface you can attach a floor to above you to create a ceiling. Then, you can extend that ceiling out in the direction you are running for consistent cover until you can get to a better shelter.