Waltuh was born on Incron. Like many in the region, he spent his early years braving the toxic harbour waters to harvest sump barnacles and razorcrabs. With savage ferocity, he began making a name for himself in the local pit fights with a series of brutal victories. He was then enlisted into the planet's militia, and from there proved himself a worthy recruit for the Astra Militarum.
It wasn't that Waltuh didn't get out of the way for the passing magistrate, it was that he didn't get out of the way quickly enough. That alone was enough to earn a one way trip to the prison ship, the Tancred Bastion.