Not sure if this has been raised before, but, seeing as I've finally, finally completed my Animorphs collection (#52 was the last one), I can talk about these books.
Anyhoo, in the beginning of The Sacrifice, Ax lets a Yeerk-falcon go while him, Rachel and James were fighting in the subway. The Yeerk pleads at him to let him go, so he can be a nothlit and free from the Kandrona and the war.
However, I think Ax's actions were morally questionable. Yes, he sacrifices causing a certain death of another soldier against them, and the Yeerk could have possibly been lying, and just morphed out in those last five minutes.
But, I'm presuming that this Yeerk had morphed to falcon from human? By Ax letting the Yeerk go, he had doomed this human to be controlled by this Yeerk 'til the end of the falcon's life. Imprisoned with no way out.
So, why did Ax let the Yeerk go? Did he not think of the human controller?
If the Yeerk had morphed to falcon from it's natural form, then, yes, Ax's actions were justified and merciful. If not, they could be considered thoughtless and cruel.
Does anyone agree whether Ax did the right thing? Or not?