[BloggingRefGuy]

Thanks for all the comments, folks. I've taken all of that into consideration, and in retrospect I've come to this conclusion: while my shoulders were parallel to the sideline, I think I turned my head and became too locked in on the dribbler...which is why I was surprised by the defender who snuck in behind my head. Next time there's a ballhandler on my line but between me and halfcourt when I'm C, I'll take that a sign to get behind her. Shuffling that way along the sideline would have enabled me to pick up the defender earlier. And if I wind up behind the T...well, this is a situation where the L should rotate anyway. If she/he doesn't, I'll adjust back to the more traditional C position as soon as I can.

I lived it, I learned it, and now I'm moving on.