Children's Palaces

I smashed painted children's palaces against the asphalt. My arm became firmer, and my step became drastic. But something was wrong; I cannot hide in the tower of my dreams anymore.

Note #1: Though I made grammar corrections, there are some usage questions I cannot answer without knowing the original text. Specifically, it would be unusual to say that one's arm became "firmer" or that one's step became "drastic."

Note #2: It would also be correct to say: "But something was wrong. I cannot hide in the tower of my dreams anymore." Using ";" instead of "." just emphasizes the close relation between the two sentences.