TTB =turn the barrel
How many know what tilt over and hold on to the damn bat means?
Because, TTB is just another way to say all the slack is taken out of the swing and there is suddenness to the swing.
TTB does not simply mean to hold on to the handle of the bat and rotate the body.
TTB suggests that there is an additional and independent action beyond the body's rotation that is working on arcing/turning/orbiting the barrel.
So looking at the bottom slo mo clip, Is there any arcing without rotation. The answer is no BTW.
I guess the girl is showing a lack of TTB because she is getting the hands ahead of rotation, not setting up a deep axis for the hands.
What do you think of 100% working on TTB? , to eliminate all the slop of trying to swing a bat.