Milk is boiling on the gas stove. You are an observer. The milk starts overflowing and you do nothing. What is the point of being an observer when you do not use your power to switch of the gas Knob.
Tap is running and the bucket is getting filled. You are an observer. What fun is it if you let the water overflow and get wasted? If you are mindful and close the tap on time on time then only you are being honest to yourself and nature.