So, yeah, based on the timing of events last night, it was probably me.  Sorry if I hit you, your reaction makes me less sorry.
Here's how I saw it.  Ki61 coming in, 600 yards out.  2 friendlies on him looked to be about 4-500 yards behind him.  The KI was pulling up into me.  I had a pretty clear angle on him from my view, what I believe might have happened is I was zoomed in on my gunsight and the angle got low without me noticing it, putting a steeper angle on my bullet stream than I thought.  What I thought I had was 2 friendlies pulling up behind a KI that was getting ready to fire.
In any case, sorry it happened, it was an honest mistake.
Wiley.