In Heidi's second scene from the shoot, we see her walking around an ornamental pond and water feature in the park. The sound of running water increases Heidi's need to pee and so she squats astride the water channel and adds her pee flow to the little stream running into the pond.
Heidi likes to enjoy the many beautiful parks in and around Vienna and in this scene we see her at towards the end of a long walk. She is a bit weary but also very desperate to pee. Heidi sits down on a bench to rest her feet and, as there is no one in the vicinity takes the opportunity to empty he straining bladder on to the path.
In this scene we see Heidi strolling through the park on a pleasant summer afternoon. She walks past a group seated group enjoying a picnic lunch and strolls into the play area. She amuses herself on a bouncy seat for a moment or two before going over and sitting on a low wall, opening her legs wide and taking a forceful pee on to the sandy ground. Heidi then kicks dry sand over the pee-soaked patch and continues her walk through the park.