For Honor : Ghost/invisible player?

Hello,
During a match in Dominion, there was a player who was able to revive his teammate and attack other players while being invisible.
Fortunately, I managed to record it

What do you guys think?
Thank You

I didn't find the right solution from the Internet.
References http://forums.ubi.com/showthread.php/1557188-For-Honor-Ghost-invisible-p...

Example Digital Imaging Video