I had a Svart roo do literally the exact same thing. One day he just decided that he had it out for boots, dark colored boots specifically. It lasted about a week and then he stopped. We also had a broody hatch chicks at the same time the behavior started, so I thought he was either just temporarily stressed or being protective. I made it a point to face him when he went for my boots and had other family members do the same. Never kick back or turn and run. Just face them and stand your ground. If you can grab them and hold them still for a while, do that for a bit and they usually settle down.
That's exactly what I did the 3rd or so time he did it. I never acted afraid of him. He just went after my boots. Didn't scare me. I kind of kicked him off but not too hard one of the times but the other day was able to nab him and I carried him around for a while. He hasn't done it again since then. I hope it is a phase that passes. It's the first time I've had a roo come after me.