When I enter a fight I realize that I have to keep my mind on more than just the cartoon plane I am engaged with. There is also the situation surrounding us that I have to keep in mind and that includes other AC entering the fight. While a 1 v 1 is generally more desirable the fight doesn't end until I depart the area successfully or die. That being said, if I see another ac in the skies during the fight then I realize that my fight just expanded by one and I have to adjust my tactics accordingly to survive. I personally never expect the other plane joining the fight to stay out of it and expand my ACM to encounter the new plane. Doing this can lead to success more often than not, regardless of rather it is one or two. In the end, if I get engaged by the second plane I would not consider it a pick at all, but poor SA on my part to have allowed it.
The old adage, it isn't over til the fat lady sings holds true. Expect the worse, hope for the best, and plan for success. Now, what I would consider a pick therefore is probably different than most would. To me, if I am engaged with 3 or more, and you not being one of the planes I am not engaged with decide to buzz thru blazing and get the kill, then I would consider that a pick of sorts as you completely robbed those earnestly engaged in my demise of any closure. Surely the odds were against my survival and your killing me only hastened it but those who had entered the fight probably deserved the kill more.