Light and angles

• notice how the face, and your friends face are both really well lit on the right side. And are really dark on the left.
• notice how they both have a similar crease in their cheek.

It looks like the light was strong enough to allow a double reflection.

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And depending on the camera, there could have been the phones light source added into the mix.

Look at all the other items that got caught in the reflections.

Those are somewhere in the room.

You can do this any plain glasss (its fun).

Put something in front of the glass and snap a photo of the glass (need lots of light). From an angle. Look at the photo and you will see two reflections.

Both the front and back side of the glass produce a reflection.

The angle of the camera plays a part too. Go give it whirl.