Renounce your swordly ways

Those that live by the sword die by the sword, right? Right. You chuck the sword out a window that happens to be closed still, causing it and a critical mass of plate glass to go crashing down 37 stories and ultimately onto one Sir Walter P Rawlingsmith's head, killing him good.

Sirens and noises erupt. Two policemen jump to your sides and arrest you.

"You are under arrest for the premurder of Sir Walter P Rawlingsmith. Everything you will say or do has already been recorded and will be used against you in the court of law. You have the right to a preattourney. Since you don't have one we've already taken the liberty of assigning one to you. We know you understand these rights so just shut up."

"What I don't understand," you explain, "Is what this is all about. I just renounced my swordly ways! How could I have killed someone?"

The policeman takes you to the window and points to the splattered remains of poor Sir Rawlingsmith.

"Oh." you say simply.