Another one...

[Shogun]

Another presumably basic question, which is probably why I can't find it in the archives (or maybe I'm just a crummy searcher)... Anyway:

I understand when screening/blocking, hands should be straight up or straight down, altho the defender (or anyone, I assume) can use his hands to protect himself in a collision. Hands/arms/legs must be in the plane of the body, ie, not wider than shoulder width. Hopefully I'm right so far...

The question:
Can the defender hold his forearm horizontally out in front of his body, out from his chest? He's not pushing or swinging, and his position is otherwise legal; he's just holding his bent arm (90 degrees) out between himself and his opponent. Seems odd to me...

So, is there anything wrong with this (assuming there's non-incidental contact)? Does it matter if his opponent has the ball or not?

Thanks!