51�Թ�

Deathracer413 is both a brotherhood and a sisterhood, says Tuli Lam, 31, a physical therapy student and one of the only women skaters in attendance today.

“Under his doctor’s instructions, Billy is undergoing specific physical therapy and has been advised to refrain from performing during this recovery period.”

He had previously postponed shows in March because of a "medical condition", which was not specified at the time, "to allow him to recover from recent surgery and to undergo physical therapy".

"I think it's more sensory feedback and biological drive than anything else," with researchers' control over their actions being rather like the muscle or nerve stimulation you might get in physical therapy, she said.

“These injuries are not only life-altering but will require extensive and ongoing medical care, including physical therapy, rehabilitation, and specialized support to help her navigate this new chapter,” the web page said.