A salutary warning for the hot weather...

[Grahamm]

I've no idea why the first guy lost it actually as that corner looked do-able, I think his foot peg touched down and he panicked?

I'd agree. He seems to be trying to get his knee down, but he and the bike are leaning virtually at the same angle and he doesn't seem to be shifting his bum over to keep the centre of gravity down and the bike more upright. Probably he was caught by surprise when he grounded the peg, felt the bike move, grabbed the brakes and just went straight on

As for the guy in the background, I think he also tries to anchor up and also goes straight on then skids on the grass.

But it just goes to show that it doesn't have to be your mistake that gets you hurt.

Absolutely.