I was assuming he killed Cece, brought her to the tank, and returned to the vehicle to do the same with Bella.
But now that WSers are pointing out he likely killed both at the truck at the same time and then deposited them one by one, I think that is probably more likely.
Well, I can see it either way.
Bella was only 4 and in a strange and scary place in very confusing circumstances. I don't know if she would've run away from the truck. I think she was literally scared stiff, and at the same time, hopeful to the end that her daddy wouldn't really, truly harm her. She was only 4 and a sweet child, not one accustomed, imo, to running from someone hurting her. She didn't know what to do.
I realize I am likely projecting. I had scary incidents and strong fears as a child that this new revelation is bringing up. As a child, I reacted to the fear by being silent and completely still - not fighting, not screaming, not running....while hoping it would all just end and everything would be okay.
Her heart was broken because her daddy betrayed her trust in him (yes, I know he did much, much, much more than that, but I'm thinking as a 4yo at this time who was very confused and very scared). I hate knowing that she was likely so confused and even hopeful up until the moment he killed her.
Still, I do agree with others that it would've been likely faster to kill them in quick succession in the truck.
jmo