Can anyone explain this??

I was playing Fallout 76 with my boyfriend and I come across another player that looked like this! The things is, my boyfriend couldn't even see them. Is this some kind of phenomenon because it freaked me the hell out!

I was playing Fallout 76 with my boyfriend and I come across another player that looked like this! The things is, my boyfriend couldn't even see them. Is this some kind of phenomenon because it freaked me the hell out!