Come on, guys. It's obvious that that's a secret HAMAS technology they are testing... I mean, not necessarily "secret" since invisible capes (see-through but not shoot-through) are pretty widespread atm... they even have that at Hogwarts.
Not a bug.
Guys, when a new player comes, just answer his question and go on your merry way, instead of going berserk! It's THAT simple!