
That is probably David with the Flare gun from the still with him wearing the hood and the long hair with the flare gun cracked open.

Unless I missed something; Xeno/Proto/Neo-Morphs don't fly. I wonder what he could be shooting at? Arguably he could be shooting up after something jumped at him, but his angle of attack is too high and the burst of fire too prolonged to make that seem a likely scenario.
I have only seen the vid once in very poor quality on my phone, though. I could easily have misinterpreted what was happening in the fuzzy, youtube lagged, 1 bar reception viewing.
I'll be watching when I get home though :)

Oh my god! I just realised, I'm a jackass lol
Its more ff style stuff. Not firing up, firing parallel. Angle was off because Lope was on the deck.
Sorry, my bad. Posted without giving it a proper viewing on the laptop.

I think this still shows him in front of the temple/shelter gate:

Pic 3 looks odd to me. The muzzle flash looks like it's 1-2 feet off the end of the barrel. Muzzle flash is always directly at the end of the barrel when it leaves it. Plus security should have flash suppressors at the end of the barrels to reduce muzzle flash during firefights in the dark. Its blinding and makes an operator useless.

Could it be recoil? And suppressors don't look as good as a bright nice muzzleflash on the big screen...
"Bees have hives, man"

They're firing fake blanks anyhow. But I think this picture sums it up nicely.

Cheers for the Screen Grabs Ati
We can make out a few things here.
*Some of those beings/dead Engineers are Human sized.
*Seems we have shots from Lope attending to a downed Rosenthal after the Neomorph attack and Davids Flair Gun.
*Other shots seem to be when Tennessee arrives in that Transport Drop Ship, and no doubt means the Mystery guy with Daniels is Lope in front of the Temple Stairs waiting for rescue.
R.I.P Sox 01/01/2006 - 11/10/2017