What is the right course of action now?

In this situation, the correct action is to perform an emergency stop because a dangerous scenario has developed where continuing to drive could lead to a collision or a serious traffic violation. According to German traffic law, you must always be prepared to stop immediately if the situation requires it, such as when another vehicle or obstacle suddenly appears, or when you are unsure whether you have priority or not. Choosing to stop quickly ensures you can avoid an accident and react appropriately to unexpected occurrences at the intersection. This rule helps maintain safety and gives you time to assess the road situation before proceeding.