Its a interesting image... but its not very detailed so its hard to work out what is going one... We can pretty much assume for sure that the one is a Engineer.
The other object well i thought it was a Space Jockey Helmet but after zooming in more, its ontop of a object that looks a bit square and out of place as far as the Juggernaughts Layout.
And so it could be a Humanoid that the Engineer is near, and maybe a Humanoid in a crouched position.
David? Another member of the Covenant Crew?
or someone who is part of the Production Team as far as lighting/camera duty?
Trying to work out where the Engineers Eyes would be and direction if they was looking straight then the Engineer would be looking past this object/person and not at it as if it was someone right in front...
So who knows....
I think if we assume its from Alien Covenant and not a Shot from behind the Scenes of Prometheus then it does raise a few possibilities.
1) Flash Back Scene of a Juggernaught and Engineer, be it from LV-223 outbreak... either prior or before.
2) Flash Back Scene related to going to/from Paradise and if so what awaits or what is left in their wake.
3)A Direct Timeline Scene.... which would maybe mean.
a) Another Engineer leaving or shown on board a Ship that has departed LV-223 after David and Shaw left.
b) Another Engineer arriving at Paradise after David/Shaw or the Covenant crew have arrived and their antics make this Engineer aware.
c) As above but maybe a Ship located on a different part of Paradise, disturbed or awakened by David/Shaw or the Covenants presence.
d) Another Engineer on board the Ship David/Shaw had taken who was left to sleep but has now awoken.
Looking at the other scenes and Engineer Culture and the Scene of Disaster, i am wondering while the other Scenes are maybe Flash Backs.... if this shot of the Juggernaught and Engineer are from Covenant... i am thinking this is a Event that happened post David/Shaw arrival.