I must say that I completely agree with your last statement

I like how well you can see the fact that NKs aren't just tiny balls the whole time, as it stretches out at the end. One tends to imagine cells as something stationary or controlled by, for example, the currents of blood. But these NKs move very much by themselves!

Honestly I had never watched a NK cell directly and seeing it was just, amazing and enlightening. Like, wow. Sorry I do not mean to have a spammy: "good post" kind of comment but I am just sitting here watching this and just, I am mesmerized by seeing it in action. Though now I have a lot of curiosity surrounding how the NK cells choses to kill, I know you stated we do not know, 100%, how it chooses but its just sparked curiosity in me now. So my question I will ask, if you are willing and have the time to answer, is what is the current leading hypothesis or model on how we think it does this? If you know.

You don't need to answer, I will probably start searching it up to see the ideas floating around but... those GIF's.

"Good post Suesa!"