I'm not sure... but... uh... what system or general area did this happen in... uhm...
If you were anywhere near Kamito/Jita/ER Longs, their nearby HIP systems, or Tote... than I will assume that it was me / you. In which case I truly do apologize! I came across 3 Mobius players yesterday/last night but either I was AFK,or just passing through quickly and didn't notice the 'blip' until after the 4-3-2-1 started.
While in my Anaconda, yesterday, I "overtook" a T9 on the way out of a station...getting hit from behind in the process. I do remember seeing a hollow square in the station on my way "IN"... BUT... the 'square' that I cut in front of was solid, could have been me/you and I may have had that "player looks like an NPC" thing happen... or It could have been just a coincidence that I cut off a T9, and you got cut off by a 'Conda.

I've been getting hit by tons of NPCs and grew tired of getting stuck half way through the slotm I've already lost 1 conda to the infamous killer known as "Trespassing" in this last week. I decided I'm not budging anymore because it's not cheap to replace, so I sort of... yeah, FORCED my way into the mail slot right in front of another ship.
Again, if it was me, really, I am sorry... I don't fly like an idiot unless I'm surrounded by maniacal NPCs making B-lines to and from their landing pads, I'll even instantly retract my weapons if in a CZ/RES and another player enters the area, even if in the middle of a fire fight atm, just to assure I don't strafe someone I'm not supposed to!
Last but not least, those are the areas I've been hanging out in lately, I use HIP 20342/Er Longs to fit the larger stuffs, good source of larger A rated system internals.. usually, but sometimes 20342 seems to run out of stock? Anywho...
Have fun, fly safe!
-Bael