Tsaheylu Glows!!!

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I quite interesting phenomenom I discovered not long ago while doing some snaphots from Avatar on my computer...

Tsaheylu Glows!




So...

As you all see, the Tsaheylu between Tsu'Tay and the Pa'li glows with a strong purple light at both disconnection AND connection.
Although, one thing that seperates the discon. and con., is that the queue itself on the Pa'li glows at con., but not discon..
And maybe it is the same thing for Na'vis! Who knows? I mean, we can't see Tsu'Tays Queue!, just the hair around! it!

Maybe some of you have seen this, but for me it is completely new!

So I then wondered if it was the same thing with Ikrans. I tried to remember a scene where you can see the bonding with an Ikran while it's dark to see the glow as good as possible (I think everyone remember that all the times Tsaheylu has been made in daylight, there has been no glow)

And I found this one. (Tsu'Tay again lol )



And would you look at that... NO GLOW!!!

My guess is that the glow itself must be some sort of Bioluminescence ofc.
But the strange thing is that, what glows really? There aren't exactly any Biolum. spots on the queues tendrils, so how???
And why NOT with Ikrans???

I'm clueless

Just the normal "What you think" (why and how) from here on!!!

Discuss!