310
You make it across the street to the roof, but you twist your ankle on landing and crash heavily against the corrugated tiles: lose 2 ENDURANCE points.
Painfully you limp to your feet and watch as the assassin makes good his escape. For a moment he halts beside a tall chimney stack and turns to look in your direction. Then three other shadowy figures emerge from behind the stack and stand at his shoulder. They stare at you silently for a few moments before turning and melting away into the night.
Having decided it would be pointless to try to follow them, you make your way down from the roof and retrace your steps back to the stables of the Crooked Sage in order to collect your horse.