Enemy have our Color

Ok, because the Forum App is sh... I can't find my topic.

Yesterday I was in Cairo, going Stairways Up and there was a engineer with blue Dots, our Team.

Then I going down and guess what:

The same Engineer followed me and killed me.

I have it in Video, for safety.

Is this a new Form of Cheat? The last time I thinked it was overlays from other HUD, bit this time all was blue, DOT and Name.

I'm on PS5 No Crossplay. 

The Building was'n destroyed, the only way to get Up ist this one Stairways in the Building at C (Conquest). It was very First Seconds.

Who have same strange experience?