And see, I pictured them the exact opposite way around, just because "Hit Wizards" sounds like "hit men" to me- someone whose primary job is to strike hard and fast and in very specific places. Also, I think it's odd that Sirius wouldn't be considered a Dark wizard when he supposedly killed thirteen people with a single curse. But then, it's never very clear what the definition of Dark magic is in canon, either, beyond the Unforgivables.