nrp wrote:
I'm flabbergasted at how many of these comments refer to not following
the radio procedures. Yes the Citation should have called, but most
important is that he didn't look.

We don't know that. Maybe he looked but didn't see. It happens. A Cherokee a
half-mile away ought to be visible, but it's not a big target. Maybe he saw,
judged that the Cherokee was not a factor.