Another 2-man mechanics question

[nine01c]

NFHS please

I have been taught over the years that if the ball goes OOB in the backcourt (ball is heading down into a new frontcourt) that the (new)Trail will administer the ball, no matter where the throw-in will occur (he may have too cross over).
And, if the ball goes OOB above the free throw line extended in the frontcourt (it is staying in the frontcourt) that whoever has that line will administer the ball. The Trail does NOT cross over in the frontcourt, but instead, the Lead will slide up on his sideline (becoming the new Trail), and the Trail will slide down his sideline and become the new Lead.

Has this changed? Does the Trail now cross over to administer the ball high (above the free throw line extended)?

Also, is the entire sideline on Lead's side still his responsibility for OOB tip-outs, etc? Or, is the Trail now responsible for the opposite sideline above the free-throw line ext. (Lead's side)?