Final answer:
Tough Luck was attempting to intimidate a rival gang when he fired a gun in LaJoe's apartment.
Step-by-step explanation:
Tough Luck was attempting to intimidate a rival gang when he fired a gun in LaJoe's apartment. This can be inferred from the passage where it states that he spent significant time planning his attack and considered various weapons before deciding on a gun. He wanted to assert his dominance and instill fear in his rivals.