Right away at the beginning
we're presented with a lone soldier, taking cover (from what/whom?) who insists he can't wait for backup and they should 'follow him in'. Why? What's the urgency? What is he going in looking for/running from? They never bother to tell us.
He seems to happen across the spectre thing accidentally - he wasn't expecting it and doesn't seem to have been aware of its existence. So what was he there to do and why was it such a rush?
They don't bother to answer any of this. He's just there to give us a guy alone being killed so the plot can move forward. This is very sloppy writing. Things that happen in movies really need to be motivated, and not just happen to convey information to the audience.
Movies these days seem to just be a bunch of disconnected scenes with no story logic behind them.