What is significant about Balram's breaking the liquor bottle in "The Sixth Night"?

While Balram is on his way to meet with his friend the diseased driver to sell him the empty scotch bottle, the quote from the poet comes back to him: “I was looking for the key for years … but the door was always open.” He smashes the bottle on the ground, leaving it with several jagged edges. This is the moment where the protagonist has become set in his objective to kill Mr. Ashok.