Swaying Ghost?

So today I called my cousin for a chat and since he lives in the forest I decided to ask him if he’s ever seen any creepy shit there especially at night. Surprisingly he said that he has. He explained to me that one night he got up to drink some water, but then he noticed something weird outside which was a glowing figure in the distance and it kept swaying. He said he stared at it for 3 minutes trying to figure out what it was and it continued to sway back and forth. He said that it did look like a person but he still wasn’t sure what it was because it was so bright. Was it a ghost? Or something else?