When could a dangerous situation arise here?

You answered correctly. A dangerous situation can arise if you continue driving at the same speed or if the cyclist changes to your lane. The cycle path is ending, as shown by the sign, so the cyclist may be forced to merge onto the road. Continuing at the same speed without anticipating this increases the risk of a collision. It's important to slow down and be ready to yield to the cyclist rejoining the traffic lane. Always watch for cyclists at the end of a cycle path, as German traffic rules require all drivers to ensure their safety when they merge into the road.