There was an article on the local news yesterday, a woman fell on the ice and broke her arm, she happened to be a lawyer of some sort, when she was interviewed she stated that by law businesses and councils are responsible for taking all reasonable steps to ensure the safety of staff and passers-by and as the path wasn't properly gritted she was entitled to take them to court for damages.....she wasn't going to, but she could have.
Your defence would go something like this
"Yes milord, I knew I was throwing copious amounts of water onto the pavement, yes I knew it was going to freeze immediately, but I left a warning note for the occupier, how was I to know that she was out and would slip and break her arm/leg before getting into the house to read my warning note!"