Mastaba is in his operating room when I go in there!
Hint 1 of 4:
You can't do much, really.
Hint 2 of 4:
Mastaba will take the blaster that you're carrying with you.
Hint 3 of 4:
If you want to keep it, run back to the elevator, go to the first floor, run
outside and drop it there. Otherwise, it'll disappear, and you'll be out of
luck.