I'm in the empty lobby now. All the normal employees have left. According to Giselle, the rest are only those who joined hand with the Vice President.
It means that I have no problem killing them all.
I'm sure you all wondering why I used teleportation instead of going through the main entrance when it's empty. It's because the main entrance and all the other entrances to this building are being watched. Not through the security camera. For that, Giselle took care of it.
My plan is still to just rescue the targets. But if I end up having to kill, I believe it would be better if I just kill everyone except for the rescue targets. I will need to spend my mana and stamina more, but that's just another strategy in case I can't escape out of this place without violence.