To make sure you don't get killed by a random, only click once. Click on the spot, and wait for about 5-10 seconds, making 100% sure that you aren't being attacked. When it's safe, you can afk all you want. That's how I do all my afk work (Fishing, Cooking, Fletching, etc). that wont work with that sandwich lady and what make it worst is the sandwich lady dont stop you from fishing, while she dont make much noise when she appears, that make it very hard to detect