A several foot plummet from the bin could be quite damaging.
Parents routinely and normally put children on their hips, putting their heads up at neck/head level of the parent. A fall from that height can be damaging as well. Some parents, especially fathers (possibly like the one the FA was interacting with during this time), will toss their children up well over their heads. A fall from that height could also be damaging.
So....I'm just not seeing the point. If the father were 6'8", as some men are, and a child fell from his arms...same thing. Of course, there was no fall in this situation.
My son got an ER visit, including an ambulance ride, because he was trying on mittens at Target. Not an inherently dangerous activity. But because DH put a hat on him at the same time, a hat that was most unpleasant for DS, and he jerked backwards and was unable to catch his fall (b/c Target's mittens are connected by plastic "wires"), he fell straight back and his head (thankfully covered in the thick fleece of the hateful hat) hit the corner of a metal clothing stand.
Which has taught me that accidents can happen anywhere. Not that we should just do any old thing, but it does give a perspective that others don't have...who would have thought that trying on mittens would be a bad thing? (and no, officer/EMT/doctor/nurse, he was NOT in the cart at the time....how many times did I answer THAT question that day? answer=countless)
The FA and the father probably weren't thinking in that moment. I'm assuming that the plane wasn't in the air since there was still ROOM in the bin. It just seems like a bit of silliness that maybe shouldn't have happened, but I'm having a hard time vilifying either of them for it.
Also, I can't imagine a child of that age NOT making it CLEAR if/when they wanted out. So I'm going to think that it was either a lot LESS than 10 seconds, or the kid wasn't upset at the moment.
I'm still going with the new behaviours as being a variation of normal for that age AS WELL as being because of the separation. If I had a good scanner I'd show the difference between how me and my brother's body language changed from when there was a dad around to when he had moved out. My whole personality changed after that happened, and you can tell in just the way I held my shoulders, how sad and skittish I became.
That's the end of it for me.