Steal his weapon and loot his body
You get a sharp rock on a stick.
Primitive spears, yippee!
continue running like a bitch, this time for the nearest stairwell

You run like a bitch to the bottom floor.
Meanwhile...

ARCHER: I'm telling you, it was a dragon.
ARCHER: It was huge and green and it gave me this spear.
CHIEF: Honestly, I'm at an impasse whether to believe you or not
CHIEF: ...But because of the situation of the place we seem to be in, anything is possible.
ARCHER: What do you suggest we do, boss?
CHIEF: As long as it's out of our hair we'll be fine. If I were you I'd worry about these two freaks and unlocking the burial tomb.
ARCHER: Orosul, our rookie was out scouting for a key.
ARCHER: He's not back yet, he's probably dead.
ARCHER: What a waste of a good pauldron...