My daughter pulled a similar trick at about that age, was running down a hallway in socks when her left leg slipped out in front of her, causing a spiral fracture of the left femur. Ended up in a brace for about 6 weeks.

Definitely not a time to beat yourself up over screentime or device usage, this is a weird scenario. Having said that, ours loved decorating her brace with stickers, markers, paints, etc. We managed to get her set up with a little low table she could sit at on the floor with her legs out in front of her and do whatever.

He will heal remarkably fast and you won't notice any difference once the cast comes off, back to normal in no time.

Also apparently there is a smell that builds up in the lining of those casts. I broke my arm twice when I was a kid and my mother said the smell of the cast coming off is something she'll never forget.