What must you watch out for now?

You answered correctly. In German residential areas, you must always pay close attention to vulnerable road users like cyclists, especially those approaching from both the left and the right sides of the road. Even when you have priority at an intersection or are driving straight, unexpected movements from cyclists can create hazardous situations. The blue car does not present an immediate hazard in this situation, so your focus should remain on both cyclists to ensure their safety and your own. This awareness is especially important in areas with many pedestrians, parked cars, and limited visibility. Recognizing this helps you react early and prevents accidents.