Do you still get stabbed if you decide to draw your gun?
In the scene where you are asking for the tickets to the guy talking on the phone. If you demand the tickets he stabs you.
Solution 1:
If you decide to draw your gun, the "ticket teller" will instead turn around, shove you away, and "close" the metal curtain, for that booth. He will come out later, and you can kill him then.
No, you will not be stabbed.
Solution 2:
Draw your gun and the teller raises his hands but the guys behind you start shooting, the teller will attack you after the shootout and you can still access the office.
Proof