The most un-epic fail ever. lol

Couldn't he use that woman as a hostage to escape?

Doubt it since she's probably behind some protective glass or enclosure. That's usually how those traps work. You're not going to trap yourself in a room with an armed person that can just kill you, lol, think about it...

Ah, I didn't know there was a barrier in front of her. Nice. I wonder what happened after this video.

I doubt a Swedish Pressbyan (it looks like the one in Central Station) has protective glass shielding the clerk, and the brief snatches of her behind seem to confirm this. It's not a locking door trap - which is why the guys are needed to keep it closed. It's almost unheard of to have that kind of protection in anything other than petrol stations, bookeeper's (betting shop) or off-licences (liquor stores). The most likely explanations include, in his urgency to get out, he didn't consider it. Or he just wanted money, and didn't actually want to commit violence. Or he knew that taking a hostage would result in a much more serious criminal penalty. Given its a train station, there is almost certainly police nearby and the incident is probably being observed on CCTV by at least transport security - so he didn't have a lot of time to get control of a hostage, convince the people blocking the door he would hurt her if they didn't open the door and then to make a getaway.

So epic.

She doesn't seem too concerned, maybe it was a setup?

*dead

Invocations (dead) cannot be called by Ralgha because Ralgha is not privileged - sorry.

Seems kind of monstrous to lock your employee in with a knife wielding psycho just to prevent him from stealing some cash. Maybe there's something I'm missing, but I agree with modulous that she doesn't seem to be protected by anything.

Try the back door?

There's no indication that the guy blocking the door works there. The YouTube video state's "people blocking the door".

Probably a passerby seeing the scene, closed the door to trap and distract the robber while not endangering themselves. The employee was already in a bad situation which couldn't really be helped without direct and dangerous intervention.