Bruno hadn't always needed a ritual in order to see the future, in fact, when he was younger, it used to happen involuntary.
It often took a lot out of him to look into the future and when he'd been a kid it would often leave him with headaches. He never told anyone about these headaches because he knew it would make it seem like he didn't want to help the village or its people. He knew his mom would be disappointed...
It got a lot worse when he was made to make prophesies for specific people. It was exhausting to try and decipher the blurry pictures in his mind and to focus them towards someone in particular? It was enough to make him dizzy.
That's why he started relying on his crutches;
The open space to breathe
The burning leaves for warmth and comfort
The sand to protect the images onto
And the physical contact with the person he was trying to see for
Even with all that it hadn't been easy. But it had become better. He didn't feel as weak after... it was just the emotional damage of always ending up disappointing the person who'd come for a prediction. Somehow Bruno never saw what they wanted him to see. Why couldn't he just see something good? Well, he could, but it was very hard to make the visions diverge from what was important. In fact it was nearly impossible to do.