Wow, he's game. I used to ice skate once but I'd never skate on ice quite that thin. Being black ice, it's likely freshly frozen so what would worry me would be

Wow, he's game. I used to ice skate once but I'd never skate on ice quite that thin. Being black ice, it's likely freshly frozen so what would worry me would be coming across a thermally insulated area where the ice wasn't yet that thick. I reckon to skate on creeking ice that made sounds like that would be most unnerving.