Question about Hudora BigWheel Air 230 Dual Brake

The handbrake of the Hudora BigWheel Air 230 Dual Brake is not directly coupled with the rear brake. Instead, there are two separate braking systems: a hand brake and a foot brake. To brake, you can either use the hand brake or step on the mudguard (the foot brake).

The brakes work as described above. You can either operate the handbrake or the foot brake separately.

And how does that work?